What sourcery is this?

app/.sourcery.yaml

@@ -0,0 +1,67 @@
+# 🪄 This is your project's Sourcery configuration file.
+
+# You can use it to get Sourcery working in the way you want, such as
+# ignoring specific refactorings, skipping directories in your project,
+# or writing custom rules.
+
+# 📚 For a complete reference to this file, see the documentation at
+# https://docs.sourcery.ai/Configuration/Project-Settings/
+
+# This file was auto-generated by Sourcery on 2023-01-18 at 16:36.
+
+version: '1'  # The schema version of this config file
+
+ignore: # A list of paths or files which Sourcery will ignore.
+- .git
+- venv
+- .venv
+- env
+- .env
+- .tox
+
+rule_settings:
+  enable:
+  - default
+  disable: []  # A list of rule IDs Sourcery will never suggest.
+  rule_types:
+  - refactoring
+  - suggestion
+  - comment
+  python_version: '3.9' # A string specifying the lowest Python version your project supports. Sourcery will not suggest refactorings requiring a higher Python version.
+
+# rules:  # A list of custom rules Sourcery will include in its analysis.
+# - id: no-print-statements
+#   description: Do not use print statements in the test directory.
+#   pattern: print(...)
+#   replacement:
+#   condition:
+#   explanation:
+#   paths:
+#     include:
+#     - test
+#     exclude:
+#     - conftest.py
+#   tests: []
+#   tags: []
+
+# rule_tags: {} # Additional rule tags.
+
+# metrics:
+#   quality_threshold: 25.0
+
+# github:
+#   labels: []
+#   ignore_labels:
+#   - sourcery-ignore
+#   request_review: author
+#   sourcery_branch: sourcery/{base_branch}
+
+# clone_detection:
+#   min_lines: 3
+#   min_duplicates: 2
+#   identical_clones_only: false
+
+# proxy:
+#   url:
+#   ssl_certs_file:
+#   no_ssl_verify: false

app/experimenter/base/management/commands/load_dummy_experiments.py

@@ -17,8 +17,8 @@ class Command(BaseCommand):
         for status, _ in Experiment.STATUS_CHOICES:
             random_type = random.choice(Experiment.TYPE_CHOICES)[0]
             experiment = ExperimentFactory.create_with_status(status, type=random_type)
-            logger.info("Created {}: {}".format(experiment, status))
+            logger.info(f"Created {experiment}: {status}")
 
         for lifecycle in NimbusExperimentFactory.LocalLifecycles:
             experiment = NimbusExperimentFactory.create_with_lifecycle(lifecycle)
-            logger.info("Created {}: {}".format(experiment, lifecycle))
+            logger.info(f"Created {experiment}: {lifecycle}")

app/experimenter/base/models.py

@@ -8,9 +8,7 @@ class SiteFlagNameChoices(models.TextChoices):
 class SiteFlagManager(models.Manager):
     def value(self, choice, defval=False):
         qs = self.get_queryset().filter(name=choice.name)
-        if qs.exists():
-            return qs.get().value
-        return defval
+        return qs.get().value if qs.exists() else defval
 
 
 class SiteFlag(models.Model):

app/experimenter/experiments/admin.py

@@ -72,12 +72,11 @@ class NimbusExperimentResource(resources.ModelResource):
 
     def get_diff_headers(self):
         skip_list = ["reference_branch_slug"]
-        headers = []
-        for field in self.get_export_fields():
-            if force_text(field.column_name) in skip_list:
-                continue
-            headers.append(force_text(field.column_name))
-        return headers
+        return [
+            force_text(field.column_name)
+            for field in self.get_export_fields()
+            if force_text(field.column_name) not in skip_list
+        ]
 
     class Meta:
         model = NimbusExperiment

app/experimenter/experiments/api/v5/queries.py

@@ -23,14 +23,14 @@ class Query(graphene.ObjectType):
         description="Nimbus Configuration Data for front-end usage.",
     )
 
-    def resolve_experiments(root, info):
+    def resolve_experiments(self, info):
         return NimbusExperiment.objects.with_owner_features()
 
-    def resolve_experiment_by_slug(root, info, slug):
+    def resolve_experiment_by_slug(self, info, slug):
         try:
             return NimbusExperiment.objects.get(slug=slug)
         except NimbusExperiment.DoesNotExist:
             return None
 
-    def resolve_nimbus_config(root, info):
+    def resolve_nimbus_config(self, info):
         return NimbusConfigurationType()

app/experimenter/experiments/api/v5/serializers.py

@@ -440,12 +440,12 @@ class NimbusBranchSerializer(serializers.ModelSerializer):
         return data
 
     def validate_name(self, value):
-        slug_name = slugify(value)
-        if not slug_name:
+        if slug_name := slugify(value):
+            return value
+        else:
             raise serializers.ValidationError(
                 "Name needs to contain alphanumeric characters."
             )
-        return value
 
     def validate(self, data):
         data = super().validate(data)
@@ -453,7 +453,7 @@ class NimbusBranchSerializer(serializers.ModelSerializer):
         feature_values = data.get("feature_values")
 
         if feature_values is not None:
-            unique_features = set(fv["feature_config"] for fv in feature_values)
+            unique_features = {fv["feature_config"] for fv in feature_values}
             if None not in unique_features and len(feature_values) != len(
                 unique_features
             ):
@@ -465,7 +465,7 @@ class NimbusBranchSerializer(serializers.ModelSerializer):
                                     NimbusConstants.ERROR_DUPLICATE_BRANCH_FEATURE_VALUE
                                 )
                             }
-                            for fv in feature_values
+                            for _ in feature_values
                         ]
                     }
                 )
@@ -500,10 +500,9 @@ class NimbusBranchSerializer(serializers.ModelSerializer):
                 )
 
     def _save_screenshots(self, screenshots, branch):
-        if screenshots is not None:
-            updated_screenshots = dict(
-                (x["id"], x) for x in screenshots if x.get("id", None)
-            )
+        if screenshots is None:
+            return
+        updated_screenshots = {x["id"]: x for x in screenshots if x.get("id", None)}
         for screenshot in branch.screenshots.all():
             screenshot_id = screenshot.id
             if screenshot_id not in updated_screenshots:
@@ -566,7 +565,7 @@ class NimbusExperimentBranchMixin:
                         },
                         "treatment_branches": [
                             {"name": NimbusConstants.ERROR_DUPLICATE_BRANCH_NAME}
-                            for i in data["treatment_branches"]
+                            for _ in data["treatment_branches"]
                         ],
                     }
                 )
@@ -591,13 +590,13 @@ class NimbusExperimentBranchMixin:
         with transaction.atomic():
             experiment = super().update(experiment, data)
 
-            if set(["reference_branch", "treatment_branches"]).intersection(
+            if {"reference_branch", "treatment_branches"}.intersection(
                 set(self.initial_data.keys())
             ):
                 saved_branch_ids = set(
                     experiment.branches.all().values_list("id", flat=True)
                 )
-                updated_branch_ids = set([b["id"] for b in branches_data if b.get("id")])
+                updated_branch_ids = {b["id"] for b in branches_data if b.get("id")}
                 deleted_branch_ids = saved_branch_ids - updated_branch_ids
                 for deleted_branch_id in deleted_branch_ids:
                     NimbusBranch.objects.get(id=deleted_branch_id).delete()
@@ -656,19 +655,19 @@ class NimbusStatusValidationMixin:
     def validate(self, data):
         data = super().validate(data)
 
-        restrictions = {
-            "status": TransitionConstants.STATUS_ALLOWS_UPDATE,
-            "publish_status": TransitionConstants.PUBLISH_STATUS_ALLOWS_UPDATE,
-        }
         update_exempt_fields = TransitionConstants.STATUS_UPDATE_EXEMPT_FIELDS
-        fields = ["all"]
         if self.instance:
             restrictive_statuses = set()
             exempt_fields = set()
+            fields = ["all"]
             fields.append("rollouts") if self.instance.is_rollout else fields.append(
                 "experiments"
             )
 
+            restrictions = {
+                "status": TransitionConstants.STATUS_ALLOWS_UPDATE,
+                "publish_status": TransitionConstants.PUBLISH_STATUS_ALLOWS_UPDATE,
+            }
             for f in fields:
                 if update_exempt_fields[f] != []:
                     exempt_fields = exempt_fields.union(update_exempt_fields[f])
@@ -949,9 +948,9 @@ class NimbusExperimentSerializer(
                 f"{NimbusExperiment.MAX_PRIMARY_OUTCOMES}."
             )
 
-        valid_outcomes = set(
-            [o.slug for o in Outcomes.by_application(self.instance.application)]
-        )
+        valid_outcomes = {
+            o.slug for o in Outcomes.by_application(self.instance.application)
+        }
 
         if valid_outcomes.intersection(value_set) != value_set:
             invalid_outcomes = value_set - valid_outcomes
@@ -963,9 +962,9 @@ class NimbusExperimentSerializer(
 
     def validate_secondary_outcomes(self, value):
         value_set = set(value)
-        valid_outcomes = set(
-            [o.slug for o in Outcomes.by_application(self.instance.application)]
-        )
+        valid_outcomes = {
+            o.slug for o in Outcomes.by_application(self.instance.application)
+        }
 
         if valid_outcomes.intersection(value_set) != value_set:
             invalid_outcomes = value_set - valid_outcomes
@@ -1146,10 +1145,7 @@ class NimbusExperimentCsvSerializer(serializers.ModelSerializer):
         return ",".join([feature.name for feature in sorted_features])
 
     def get_results_url(self, obj):
-        if obj.results_ready:
-            return obj.experiment_url + "results"
-        else:
-            return ""
+        return f"{obj.experiment_url}results" if obj.results_ready else ""
 
 
 class NimbusBranchScreenshotReviewSerializer(NimbusBranchScreenshotSerializer):
@@ -1176,7 +1172,7 @@ class NimbusBranchFeatureValueReviewSerializer(NimbusBranchFeatureValueSerialize
             try:
                 json.loads(value)
             except Exception as e:
-                raise serializers.ValidationError(f"Invalid JSON: {e.msg}")
+                raise serializers.ValidationError(f"Invalid JSON: {e.msg}") from e
         return value
 
     def validate(self, data):
@@ -1190,7 +1186,7 @@ class NimbusBranchFeatureValueReviewSerializer(NimbusBranchFeatureValueSerialize
         # This check can be removed with #6744
         branch_feature_value_id = data.get("id")
         branch_feature_value = self.Meta.model.objects.get(id=branch_feature_value_id)
-        if not branch_feature_value.branch.experiment.feature_configs.count() > 1:
+        if branch_feature_value.branch.experiment.feature_configs.count() <= 1:
             return data
 
         if all([branch, feature_config, value]) and feature_config.schema:
@@ -1199,7 +1195,7 @@ class NimbusBranchFeatureValueReviewSerializer(NimbusBranchFeatureValueSerialize
                 jsonschema.validate(json_value, json.loads(feature_config.schema))
             except jsonschema.ValidationError as e:
                 if not branch.experiment.warn_feature_schema:
-                    raise serializers.ValidationError({"value": e.message})
+                    raise serializers.ValidationError({"value": e.message}) from e
 
         return data
 
@@ -1213,7 +1209,7 @@ class NimbusBranchReviewSerializer(NimbusBranchSerializer):
             try:
                 json.loads(value)
             except Exception as e:
-                raise serializers.ValidationError(f"Invalid JSON: {e.msg}")
+                raise serializers.ValidationError(f"Invalid JSON: {e.msg}") from e
         return value
 
     def validate(self, data):
@@ -1325,7 +1321,7 @@ class NimbusReviewSerializer(serializers.ModelSerializer):
                 error["description"] = [NimbusConstants.ERROR_REQUIRED_FIELD]
             errors.append(error)
 
-        if any(x for x in errors):
+        if any(errors):
             raise serializers.ValidationError(errors)
         return value
 
@@ -1379,10 +1375,9 @@ class NimbusReviewSerializer(serializers.ModelSerializer):
         error_result = {}
         if data["reference_branch"].get("feature_enabled"):
 
-            errors = self._validate_feature_value_against_schema(
+            if errors := self._validate_feature_value_against_schema(
                 schema, data["reference_branch"]["feature_value"]
-            )
-            if errors:
+            ):
                 if warn_feature_schema:
                     self.warnings["reference_branch"] = {"feature_value": errors}
                 else:
@@ -1395,10 +1390,9 @@ class NimbusReviewSerializer(serializers.ModelSerializer):
             branch_warning = None
 
             if branch_data.get("feature_enabled", False):
-                errors = self._validate_feature_value_against_schema(
+                if errors := self._validate_feature_value_against_schema(
                     schema, branch_data["feature_value"]
-                )
-                if errors:
+                ):
                     if warn_feature_schema:
                         branch_warning = {"feature_value": errors}
                     else:
@@ -1441,10 +1435,7 @@ class NimbusReviewSerializer(serializers.ModelSerializer):
         application = data.get("application")
         min_version = data.get("firefox_min_version", "")
 
-        languages = data.get("languages", [])
-
-        if languages:
-
+        if languages := data.get("languages", []):
             min_supported_version = (
                 NimbusConstants.LANGUAGES_APPLICATION_SUPPORTED_VERSION[application]
             )
@@ -1465,10 +1456,7 @@ class NimbusReviewSerializer(serializers.ModelSerializer):
         application = data.get("application")
         min_version = data.get("firefox_min_version", "")
 
-        countries = data.get("countries", [])
-
-        if countries:
-
+        if countries := data.get("countries", []):
             min_supported_version = (
                 NimbusConstants.COUNTRIES_APPLICATION_SUPPORTED_VERSION[application]
             )
@@ -1509,14 +1497,11 @@ class NimbusReviewSerializer(serializers.ModelSerializer):
 
     def _validate_feature_enabled_for_treatment_branches(self, data):
         if self._validate_feature_enabled_version(data) and "treatment_branches" in data:
-            treatment_branches_error = []
-            for branch in data["treatment_branches"]:
-                if not branch["feature_enabled"]:
-                    treatment_branches_error.append(
+            if treatment_branches_error := [
                 {"feature_enabled": NimbusConstants.ERROR_FEATURE_ENABLED}
-                    )
-
-            if treatment_branches_error:
+                for branch in data["treatment_branches"]
+                if not branch["feature_enabled"]
+            ]:
                 raise serializers.ValidationError(
                     {"treatment_branches": treatment_branches_error}
                 )
@@ -1601,8 +1586,7 @@ class NimbusExperimentCloneSerializer(
 
     def validate(self, data):
         data = super().validate(data)
-        rollout_branch_slug = data.get("rollout_branch_slug", None)
-        if rollout_branch_slug:
+        if rollout_branch_slug := data.get("rollout_branch_slug", None):
             parent = data.get("parent_slug")
             if not parent.branches.filter(slug=rollout_branch_slug).exists():
                 raise serializers.ValidationError(

app/experimenter/experiments/api/v5/types.py

@@ -143,8 +143,8 @@ class NimbusFeatureConfigType(DjangoObjectType):
     class Meta:
         model = NimbusFeatureConfig
 
-    def resolve_sets_prefs(root, info):
-        return bool(root.sets_prefs)
+    def resolve_sets_prefs(self, info):
+        return bool(self.sets_prefs)
 
 
 class NimbusBranchScreenshotType(DjangoObjectType):
@@ -155,9 +155,9 @@ class NimbusBranchScreenshotType(DjangoObjectType):
     class Meta:
         model = NimbusBranchScreenshot
 
-    def resolve_image(root, info):
-        if root.image and root.image.name:
-            return root.image.url
+    def resolve_image(self, info):
+        if self.image and self.image.name:
+            return self.image.url
 
 
 class NimbusBranchFeatureValueType(DjangoObjectType):
@@ -181,20 +181,21 @@ class NimbusBranchType(DjangoObjectType):
         model = NimbusBranch
         exclude = ("experiment", "nimbusexperiment")
 
-    def resolve_feature_values(root, info):
-        return root.feature_values.all()
+    def resolve_feature_values(self, info):
+        return self.feature_values.all()
 
-    def resolve_feature_enabled(root, info):
+    def resolve_feature_enabled(self, info):
         return (
-            root.feature_values.exists()
-            and root.feature_values.all().order_by("feature_config__slug").first().enabled
+            self.feature_values.exists()
+            and self.feature_values.all().order_by("feature_config__slug").first().enabled
         )
 
-    def resolve_feature_value(root, info):
+    def resolve_feature_value(self, info):
         return (
-            root.feature_values.exists()
-            and root.feature_values.all().order_by("feature_config__slug").first().value
-        ) or ""
+            self.feature_values.exists()
+            and self.feature_values.all().order_by("feature_config__slug").first().value
+            or ""
+        )
 
 
 class NimbusDocumentationLinkType(DjangoObjectType):
@@ -274,7 +275,7 @@ class NimbusConfigurationType(graphene.ObjectType):
     conclusion_recommendations = graphene.List(NimbusLabelValueType)
     types = graphene.List(NimbusLabelValueType)
 
-    def _text_choices_to_label_value_list(root, text_choices):
+    def _text_choices_to_label_value_list(self, text_choices):
         return [
             NimbusLabelValueType(
                 label=text_choices[name].label,
@@ -283,13 +284,13 @@ class NimbusConfigurationType(graphene.ObjectType):
             for name in text_choices.names
         ]
 
-    def resolve_applications(root, info):
-        return root._text_choices_to_label_value_list(NimbusExperiment.Application)
+    def resolve_applications(self, info):
+        return self._text_choices_to_label_value_list(NimbusExperiment.Application)
 
-    def resolve_channels(root, info):
-        return root._text_choices_to_label_value_list(NimbusExperiment.Channel)
+    def resolve_channels(self, info):
+        return self._text_choices_to_label_value_list(NimbusExperiment.Channel)
 
-    def resolve_application_configs(root, info):
+    def resolve_application_configs(self, info):
         configs = []
         for application in NimbusExperiment.Application:
             application_config = NimbusExperiment.APPLICATION_CONFIGS[application]
@@ -305,14 +306,14 @@ class NimbusConfigurationType(graphene.ObjectType):
             )
         return configs
 
-    def resolve_all_feature_configs(root, info):
+    def resolve_all_feature_configs(self, info):
         return NimbusFeatureConfig.objects.all().order_by("name")
 
-    def resolve_firefox_versions(root, info):
+    def resolve_firefox_versions(self, info):
         return NimbusConfigurationType.sort_version_choices(NimbusExperiment.Version)
 
-    def resolve_conclusion_recommendations(root, info):
-        return root._text_choices_to_label_value_list(
+    def resolve_conclusion_recommendations(self, info):
+        return self._text_choices_to_label_value_list(
             NimbusExperiment.ConclusionRecommendation
         )
 
@@ -331,10 +332,10 @@ class NimbusConfigurationType(graphene.ObjectType):
 
         return sorted_versions
 
-    def resolve_outcomes(root, info):
+    def resolve_outcomes(self, info):
         return Outcomes.all()
 
-    def resolve_owners(root, info):
+    def resolve_owners(self, info):
         return (
             get_user_model()
             .objects.filter(owned_nimbusexperiments__isnull=False)
@@ -342,7 +343,7 @@ class NimbusConfigurationType(graphene.ObjectType):
             .order_by("email")
         )
 
-    def resolve_targeting_configs(root, info):
+    def resolve_targeting_configs(self, info):
         return [
             NimbusExperimentTargetingConfigType(
                 label=choice.label,
@@ -361,29 +362,29 @@ class NimbusConfigurationType(graphene.ObjectType):
             for choice in NimbusExperiment.TargetingConfig
         ]
 
-    def resolve_hypothesis_default(root, info):
+    def resolve_hypothesis_default(self, info):
         return NimbusExperiment.HYPOTHESIS_DEFAULT
 
-    def resolve_max_primary_outcomes(root, info):
+    def resolve_max_primary_outcomes(self, info):
         return NimbusExperiment.MAX_PRIMARY_OUTCOMES
 
-    def resolve_documentation_link(root, info):
-        return root._text_choices_to_label_value_list(NimbusExperiment.DocumentationLink)
+    def resolve_documentation_link(self, info):
+        return self._text_choices_to_label_value_list(NimbusExperiment.DocumentationLink)
 
-    def resolve_locales(root, info):
+    def resolve_locales(self, info):
         return Locale.objects.all().order_by("name")
 
-    def resolve_countries(root, info):
+    def resolve_countries(self, info):
         return Country.objects.all().order_by("name")
 
-    def resolve_languages(root, info):
+    def resolve_languages(self, info):
         return Language.objects.all().order_by("name")
 
-    def resolve_projects(root, info):
+    def resolve_projects(self, info):
         return Project.objects.all().order_by("name")
 
-    def resolve_types(root, info):
-        return root._text_choices_to_label_value_list(NimbusExperiment.Type)
+    def resolve_types(self, info):
+        return self._text_choices_to_label_value_list(NimbusExperiment.Type)
 
 
 class NimbusExperimentType(DjangoObjectType):
@@ -454,9 +455,9 @@ class NimbusExperimentType(DjangoObjectType):
         return self.projects.all()
 
     def resolve_reference_branch(self, info):
-        if self.reference_branch:
-            return self.reference_branch
-        return NimbusBranch(name=NimbusConstants.DEFAULT_REFERENCE_BRANCH_NAME)
+        return self.reference_branch or NimbusBranch(
+            name=NimbusConstants.DEFAULT_REFERENCE_BRANCH_NAME
+        )
 
     def resolve_treatment_branches(self, info):
         if self.branches.exists():

app/experimenter/experiments/api/v5/views.py

@@ -11,7 +11,7 @@ from experimenter.experiments.models import NimbusExperiment
 
 class NimbusExperimentCsvRenderer(CSVRenderer):
     header = NimbusExperimentCsvSerializer.Meta.fields
-    labels = dict(((field, field.replace("_", " ").title()) for field in header))
+    labels = {field: field.replace("_", " ").title() for field in header}
 
 
 class NimbusExperimentCsvListView(ListAPIView):

app/experimenter/experiments/migrations/0002_auto_20171115_1918.py

@@ -46,7 +46,10 @@ class Migration(migrations.Migration):
                         max_length=255,
                     ),
                 ),
-                ("pref_key", models.CharField(blank=True, max_length=255, null=True)),
+                (
+                    "pref_key",
+                    models.CharField(blank=True, max_length=255, null=True),
+                ),
                 (
                     "pref_type",
                     models.CharField(
@@ -61,7 +64,8 @@ class Migration(migrations.Migration):
                 (
                     "pref_branch",
                     models.CharField(
-                        choices=[("default", "default"), ("user", "user")], max_length=255
+                        choices=[("default", "default"), ("user", "user")],
+                        max_length=255,
                     ),
                 ),
                 ("firefox_version", models.CharField(max_length=255)),
@@ -81,9 +85,15 @@ class Migration(migrations.Migration):
                 ("name", models.CharField(max_length=255, unique=True)),
                 ("slug", models.SlugField(max_length=255, unique=True)),
                 ("objectives", models.TextField(default="")),
-                ("analysis", models.TextField(blank=True, default="", null=True)),
+                (
+                    "analysis",
+                    models.TextField(blank=True, default="", null=True),
+                ),
                 ("dashboard_url", models.URLField(blank=True, null=True)),
-                ("dashboard_image_url", models.URLField(blank=True, null=True)),
+                (
+                    "dashboard_image_url",
+                    models.URLField(blank=True, null=True),
+                ),
                 (
                     "population_percent",
                     models.DecimalField(decimal_places=4, default="0", max_digits=7),
@@ -97,7 +107,10 @@ class Migration(migrations.Migration):
                     ),
                 ),
             ],
-            options={"verbose_name": "Experiment", "verbose_name_plural": "Experiments"},
+            options={
+                "verbose_name": "Experiment",
+                "verbose_name_plural": "Experiments",
+            },
         ),
         migrations.CreateModel(
             name="ExperimentChangeLog",
@@ -182,7 +195,10 @@ class Migration(migrations.Migration):
                 ("is_control", models.BooleanField(default=False)),
                 ("description", models.TextField(default="")),
                 ("ratio", models.PositiveIntegerField(default=1)),
-                ("value", django.contrib.postgres.fields.jsonb.JSONField(default=False)),
+                (
+                    "value",
+                    django.contrib.postgres.fields.jsonb.JSONField(default=False),
+                ),
                 (
                     "experiment",
                     models.ForeignKey(
@@ -199,6 +215,9 @@ class Migration(migrations.Migration):
         ),
         migrations.AlterUniqueTogether(
             name="experimentvariant",
-            unique_together=set([("is_control", "experiment"), ("slug", "experiment")]),
+            unique_together={
+                ("is_control", "experiment"),
+                ("slug", "experiment"),
+            },
         ),
     ]

app/experimenter/experiments/migrations/0006_auto_20180221_1939.py

@@ -15,7 +15,7 @@ def update_dates(apps, schema_editor):  # pragma: no cover
                 experiment=experiment, old_status="Accepted", new_status="Launched"
             ).changed_on
             experiment.proposed_start_date = start_date
-        except:
+        except Exception:
             pass
 
         try:
@@ -23,7 +23,7 @@ def update_dates(apps, schema_editor):  # pragma: no cover
                 experiment=experiment, old_status="Launched", new_status="Complete"
             ).changed_on
             experiment.proposed_end_date = end_date
-        except:
+        except Exception:
             pass
         experiment.save()
 
@@ -32,7 +32,7 @@ def update_versions(apps, schema_editor):  # pragma: no cover
     Experiment = apps.get_model("experiments", "Experiment")
 
     for experiment in Experiment.objects.all():
-        experiment.firefox_version = "{}.0".format(experiment.firefox_version)
+        experiment.firefox_version = f"{experiment.firefox_version}.0"
         experiment.save()
 
 
@@ -40,7 +40,7 @@ def add_project_to_name(apps, schema_editor):  # pragma: no cover
     Experiment = apps.get_model("experiments", "Experiment")
 
     for experiment in Experiment.objects.all():
-        experiment.name = "{} {}".format(experiment.project.name, experiment.name)
+        experiment.name = f"{experiment.project.name} {experiment.name}"
         experiment.save()
 
 

app/experimenter/experiments/migrations/0018_auto_20180820_1544.py

@@ -17,6 +17,6 @@ class Migration(migrations.Migration):
             field=django.contrib.postgres.fields.jsonb.JSONField(blank=True, null=True),
         ),
         migrations.AlterUniqueTogether(
-            name="experimentvariant", unique_together=set([("slug", "experiment")])
+            name="experimentvariant", unique_together={("slug", "experiment")}
         ),
     ]

app/experimenter/experiments/migrations/0069_experimentchangelog_changed_vals.py

@@ -9,8 +9,8 @@ class Migration(migrations.Migration):
 
     dependencies = [("experiments", "0068_experiment_related_to")]
 
-    def format_to_new_changelog(apps, schema_editor):
-        ExperimentChangeLog = apps.get_model("experiments", "ExperimentChangeLog")
+    def format_to_new_changelog(self, schema_editor):
+        ExperimentChangeLog = self.get_model("experiments", "ExperimentChangeLog")
         for changeLog in ExperimentChangeLog.objects.all():
             changed_values = {}
             # ensure change log has new_values

app/experimenter/experiments/migrations/0072_changelog_pruning.py

@@ -12,11 +12,11 @@ class Migration(migrations.Migration):
 
     dependencies = [("experiments", "0071_auto_20190911_1515")]
 
-    def prune_new_changelog(apps, schema_editor):
+    def prune_new_changelog(self, schema_editor):
 
-        ExperimentChangeLog = apps.get_model("experiments", "ExperimentChangeLog")
+        ExperimentChangeLog = self.get_model("experiments", "ExperimentChangeLog")
 
-        Experiment = apps.get_model("experiments", "experiment")
+        Experiment = self.get_model("experiments", "experiment")
 
         for experiment in Experiment.objects.all():
             change_logs = experiment.changes.filter(old_status=None).order_by(
@@ -36,7 +36,7 @@ class Migration(migrations.Migration):
             current_date = None
             for change in changes:
                 if change.changed_on.date() != current_date:
-                    seen_edits = set([change.changed_by.email])
+                    seen_edits = {change.changed_by.email}
                     current_date = change.changed_on.date()
                 elif change.changed_by.email in seen_edits:
                     change.delete()

app/experimenter/experiments/migrations/0121_prune_add_version_changelogs.py

@@ -9,9 +9,9 @@ class Migration(migrations.Migration):
         ("experiments", "0120_add_feature_config"),
     ]
 
-    def prune_new_changelog(apps, schema_editor):
+    def prune_new_changelog(self, schema_editor):
 
-        ExperimentChangeLog = apps.get_model("experiments", "ExperimentChangeLog")
+        ExperimentChangeLog = self.get_model("experiments", "ExperimentChangeLog")
 
         ExperimentChangeLog.objects.filter(
             message="Added Version(s)",

app/experimenter/experiments/migrations/0122_prune_all_add_version_changelogs.py

@@ -9,9 +9,9 @@ class Migration(migrations.Migration):
         ("experiments", "0121_prune_add_version_changelogs"),
     ]
 
-    def prune_new_changelog(apps, schema_editor):
+    def prune_new_changelog(self, schema_editor):
 
-        ExperimentChangeLog = apps.get_model("experiments", "ExperimentChangeLog")
+        ExperimentChangeLog = self.get_model("experiments", "ExperimentChangeLog")
 
         ExperimentChangeLog.objects.filter(
             message="Added Version(s)",

app/experimenter/experiments/migrations/0133_prune_pop_percent_logs.py

@@ -7,9 +7,9 @@ class Migration(migrations.Migration):
         ("experiments", "0132_auto_20201103_1710"),
     ]
 
-    def prune_new_changelog(apps, schema_editor):
+    def prune_new_changelog(self, schema_editor):
 
-        ExperimentChangeLog = apps.get_model("experiments", "ExperimentChangeLog")
+        ExperimentChangeLog = self.get_model("experiments", "ExperimentChangeLog")
 
         ExperimentChangeLog.objects.filter(
             message="Updated Population Percent", changed_values={}

app/experimenter/experiments/migrations/0170_restore_feature_configs.py

@@ -7,7 +7,7 @@ def restore_feature_configs(apps, schema_editor):
     NimbusExperiment = apps.get_model("experiments", "NimbusExperiment")
     NimbusFeatureConfig = apps.get_model("experiments", "NimbusFeatureConfig")
     for experiment in NimbusExperiment.objects.all():
-        feature_slug = (
+        if feature_slug := (
             experiment.changes.all()
             .exclude(experiment_data__feature_config=None)
             .exclude(experiment_data__feature_config__slug="no-feature-firefox-desktop")
@@ -16,9 +16,7 @@ def restore_feature_configs(apps, schema_editor):
             .order_by("-changed_on")
             .values_list("experiment_data__feature_config__slug", flat=True)
             .first()
-        )
-
-        if feature_slug:
+        ):
             feature_config = NimbusFeatureConfig.objects.get(slug=feature_slug)
             experiment.feature_config = feature_config
             experiment.save()

app/experimenter/experiments/migrations/0213_alter_nimbusexperiment_languages_field_for_mobile_client.py

@@ -10,9 +10,7 @@ def update_languages_field_for_mobile_client(apps, schema_editor):
     ):
         for locale in experiment.locales.all():
             locale_code = locale.code[:2]
-            language = Language.objects.filter(code=locale_code).first()
-            if language:
-
+            if language := Language.objects.filter(code=locale_code).first():
                 experiment.languages.add(language.id)
         experiment.locales.clear()
 

app/experimenter/experiments/migrations/0218_update_results_data_schema.py

@@ -11,8 +11,7 @@ def update_results_data_schema(apps, schema_editor):
         if data is not None:
             for key, value in data.items():
                 if value is not None and key in windows and "all" not in value:
-                    data[key] = {}
-                    data[key]["all"] = value
+                    data[key] = {"all": value}
                 else:
                     data[key] = value
 

app/experimenter/experiments/migrations/0224_analysis_add_basis.py

@@ -10,11 +10,10 @@ def analysis_add_basis(apps, schema_editor):
     windows = ["daily", "weekly", "overall"]
     default_analysis_basis = "enrollments"
     for experiment in NimbusExperiment.objects.all():
-        new_data = {}
         results = experiment.results_data
         if results is not None and "v2" not in results:
             data = results["v1"]
-            new_data["v1"] = copy.deepcopy(data)
+            new_data = {"v1": copy.deepcopy(data)}
             if data is not None:
                 for key, value in data.items():
                     if (
@@ -22,8 +21,7 @@ def analysis_add_basis(apps, schema_editor):
                         and key in windows
                         and default_analysis_basis not in value
                     ):
-                        data[key] = {}
-                        data[key][default_analysis_basis] = value
+                        data[key] = {default_analysis_basis: value}
                     else:
                         data[key] = value
 

app/experimenter/experiments/models.py

@@ -334,29 +334,25 @@ class NimbusExperiment(NimbusConstants, TargetingConstants, FilterMixin, models.
             sticky_expressions.append(self.targeting_config.targeting)
 
         is_desktop = self.application == self.Application.DESKTOP
-        if is_desktop:
-            if self.channel:
+        if is_desktop and self.channel:
             expressions.append(f'browserSettings.update.channel == "{self.channel}"')
 
         sticky_expressions.extend(self._get_targeting_min_version())
         expressions.extend(self._get_targeting_max_version())
 
-        locales = self.locales.all()
-        if locales:
+        if locales := self.locales.all():
             locales = [locale.code for locale in sorted(locales, key=lambda l: l.code)]
 
             sticky_expressions.append(f"locale in {locales}")
 
-        languages = self.languages.all()
-        if languages:
+        if languages := self.languages.all():
             languages = [
                 language.code for language in sorted(languages, key=lambda l: l.code)
             ]
 
             sticky_expressions.append(f"language in {languages}")
 
-        countries = self.countries.all()
-        if countries:
+        if countries := self.countries.all():
             countries = [
                 country.code for country in sorted(countries, key=lambda c: c.code)
             ]
@@ -365,10 +361,10 @@ class NimbusExperiment(NimbusConstants, TargetingConstants, FilterMixin, models.
         if self.is_sticky and sticky_expressions:
             sticky_clause = "is_already_enrolled"
             if is_desktop:
-                sticky_clause = "experiment.slug in activeExperiments"
                 if self.is_rollout:
                     sticky_clause = "experiment.slug in activeRollouts"
-
+                else:
+                    sticky_clause = "experiment.slug in activeExperiments"
             sticky_expressions_joined = " && ".join(
                 [f"({expression})" for expression in sticky_expressions]
             )
@@ -381,10 +377,11 @@ class NimbusExperiment(NimbusConstants, TargetingConstants, FilterMixin, models.
             expressions.extend(f"!('{pref}'|preferenceIsUserSet)" for pref in prefs)
 
         #  If there is no targeting defined all clients should match, so we return "true"
-        if len(expressions) == 0:
-            return "true"
-
-        return " && ".join([f"({expression})" for expression in expressions])
+        return (
+            " && ".join([f"({expression})" for expression in expressions])
+            if expressions
+            else "true"
+        )
 
     @property
     def application_config(self):
@@ -416,14 +413,12 @@ class NimbusExperiment(NimbusConstants, TargetingConstants, FilterMixin, models.
             return self._start_date
 
         if self.is_started:
-            start_changelogs = [
+            if start_changelogs := [
                 c
                 for c in self.changes.all()
                 if c.old_status == NimbusExperiment.Status.DRAFT
                 and c.new_status == NimbusExperiment.Status.LIVE
-            ]
-
-            if start_changelogs:
+            ]:
                 start_date = sorted(start_changelogs, key=lambda c: c.changed_on)[
                     -1
                 ].changed_on.date()
@@ -443,14 +438,12 @@ class NimbusExperiment(NimbusConstants, TargetingConstants, FilterMixin, models.
 
         if self.status == self.Status.COMPLETE:
             changes = self.changes.all()
-            end_changelogs = [
+            if end_changelogs := [
                 c
                 for c in changes
                 if c.old_status == self.Status.LIVE
                 and c.new_status == self.Status.COMPLETE
-            ]
-
-            if end_changelogs:
+            ]:
                 end_date = sorted(end_changelogs, key=lambda c: c.changed_on)[
                     -1
                 ].changed_on.date()
@@ -474,7 +467,7 @@ class NimbusExperiment(NimbusConstants, TargetingConstants, FilterMixin, models.
             return (self._enrollment_end_date - self._start_date).days
 
         changes = self.changes.all()
-        paused_changelogs = [
+        if paused_changelogs := [
             c
             for c in changes
             if c.experiment_data is not None
@@ -483,9 +476,7 @@ class NimbusExperiment(NimbusConstants, TargetingConstants, FilterMixin, models.
             and c.new_status == NimbusExperiment.Status.LIVE
             and c.new_status_next is None
             and c.new_publish_status == NimbusExperiment.PublishStatus.IDLE
-        ]
-
-        if paused_changelogs:
+        ]:
             paused_change = sorted(paused_changelogs, key=lambda c: c.changed_on)[-1]
             self._enrollment_end_date = paused_change.changed_on.date()
             self.save()
@@ -505,10 +496,7 @@ class NimbusExperiment(NimbusConstants, TargetingConstants, FilterMixin, models.
 
     @property
     def computed_end_date(self):
-        if self.end_date:
-            return self.end_date
-        else:
-            return self.proposed_end_date
+        return self.end_date or self.proposed_end_date
 
     @property
     def enrollment_duration(self):
@@ -590,9 +578,10 @@ class NimbusExperiment(NimbusConstants, TargetingConstants, FilterMixin, models.
             self.application_config.slug,
         ]
 
-        for feature_config in self.feature_configs.all().order_by("slug"):
-            keys.append(feature_config.slug)
-
+        keys.extend(
+            feature_config.slug
+            for feature_config in self.feature_configs.all().order_by("slug")
+        )
         if self.channel:
             keys.append(self.channel)
 
@@ -833,10 +822,7 @@ class NimbusBranchScreenshot(models.Model):
         ordering = ["id"]
 
     def delete(self, *args, **kwargs):
-        old_image_name = None
-        if self.image and self.image.name:
-            old_image_name = self.image.name
-
+        old_image_name = self.image.name if self.image and self.image.name else None
         super().delete(*args, **kwargs)
 
         if old_image_name and self.image.storage.exists(old_image_name):
@@ -1104,12 +1090,9 @@ class NimbusChangeLog(FilterMixin, models.Model):
         COMPLETED = "Experiment is complete"
 
     def __str__(self):
-        if self.message:
-            return self.message
-        else:
         return (
-                f"{self.old_status} > {self.new_status} "
-                f"by {self.changed_by} on {self.changed_on}"
+            self.message
+            or f"{self.old_status} > {self.new_status} by {self.changed_by} on {self.changed_on}"
         )
 
 

app/experimenter/experiments/tests/api/v5/test_mutations.py

@@ -1112,7 +1112,7 @@ class TestUpdateExperimentMutationMultiFeature(GraphQLTestCase):
         experiment = NimbusExperiment.objects.get(id=experiment.id)
         self.assertEqual(
             set(experiment.feature_configs.all().values_list("id", flat=True)),
-            set([feature1.id, feature2.id]),
+            {feature1.id, feature2.id},
         )
 
         self.assertEqual(experiment.branches.count(), 2)

app/experimenter/experiments/tests/api/v5/test_queries.py

@@ -1497,9 +1497,7 @@ class TestNimbusConfigQuery(GraphQLTestCase):
             ]
             self.assertEqual(
                 set(channels),
-                set(
-                    [channel.name for channel in application_config.channel_app_id.keys()]
-                ),
+                {channel.name for channel in application_config.channel_app_id.keys()},
             )
 
         self.assertEqual(config["owners"], [{"username": experiment.owner.username}])

app/experimenter/experiments/tests/api/v5/test_serializers/test_nimbus_configuration_serializer.py

@@ -54,9 +54,7 @@ class TestNimbusConfigurationSerializer(TestCase):
             ]
             self.assertEqual(
                 set(channels),
-                set(
-                    [channel.name for channel in application_config.channel_app_id.keys()]
-                ),
+                {channel.name for channel in application_config.channel_app_id.keys()},
             )
 
         self.assertEqual(config["owners"], [{"username": experiment.owner.username}])

app/experimenter/experiments/tests/api/v5/test_serializers/test_nimbus_experiment_branch_mixin.py

@@ -258,7 +258,7 @@ class TestNimbusExperimentBranchMixinSingleFeature(TestCase):
                 "reference_branch": {"name": NimbusConstants.ERROR_DUPLICATE_BRANCH_NAME},
                 "treatment_branches": [
                     {"name": NimbusConstants.ERROR_DUPLICATE_BRANCH_NAME}
-                    for i in data["treatment_branches"]
+                    for _ in data["treatment_branches"]
                 ],
             },
         )
@@ -315,7 +315,7 @@ class TestNimbusExperimentBranchMixinMultiFeature(TestCase):
         experiment = NimbusExperiment.objects.get(id=experiment.id)
         self.assertEqual(
             set(experiment.feature_configs.all().values_list("id", flat=True)),
-            set([feature_config1.id, feature_config2.id]),
+            {feature_config1.id, feature_config2.id},
         )
 
         self.assertEqual(experiment.reference_branch.name, "control")
@@ -327,7 +327,7 @@ class TestNimbusExperimentBranchMixinMultiFeature(TestCase):
                     "feature_config__id", flat=True
                 )
             ),
-            set([feature_config1.id, feature_config2.id]),
+            {feature_config1.id, feature_config2.id},
         )
 
         self.assertEqual(len(experiment.treatment_branches), 1)
@@ -340,7 +340,7 @@ class TestNimbusExperimentBranchMixinMultiFeature(TestCase):
                 .feature_values.all()
                 .values_list("feature_config__id", flat=True)
             ),
-            set([feature_config1.id, feature_config2.id]),
+            {feature_config1.id, feature_config2.id},
         )
 
     def test_serializer_replace_branches(self):
@@ -387,7 +387,7 @@ class TestNimbusExperimentBranchMixinMultiFeature(TestCase):
         experiment = NimbusExperiment.objects.get(id=experiment.id)
         self.assertEqual(
             set(experiment.feature_configs.all().values_list("id", flat=True)),
-            set([feature_config1.id, feature_config2.id]),
+            {feature_config1.id, feature_config2.id},
         )
         self.assertEqual(
             set(experiment.branches.all().values_list("id", flat=True)).intersection(
@@ -405,7 +405,7 @@ class TestNimbusExperimentBranchMixinMultiFeature(TestCase):
                     "feature_config__id", flat=True
                 )
             ),
-            set([feature_config1.id, feature_config2.id]),
+            {feature_config1.id, feature_config2.id},
         )
 
         self.assertEqual(len(experiment.treatment_branches), 1)
@@ -418,7 +418,7 @@ class TestNimbusExperimentBranchMixinMultiFeature(TestCase):
                 .feature_values.all()
                 .values_list("feature_config__id", flat=True)
             ),
-            set([feature_config1.id, feature_config2.id]),
+            {feature_config1.id, feature_config2.id},
         )
 
     def test_serializer_update_branches_with_ids(self):
@@ -467,7 +467,7 @@ class TestNimbusExperimentBranchMixinMultiFeature(TestCase):
         experiment = NimbusExperiment.objects.get(id=experiment.id)
         self.assertEqual(
             set(experiment.feature_configs.all().values_list("id", flat=True)),
-            set([feature_config1.id, feature_config2.id]),
+            {feature_config1.id, feature_config2.id},
         )
         self.assertEqual(
             set(experiment.branches.all().values_list("id", flat=True)), branch_ids
@@ -482,7 +482,7 @@ class TestNimbusExperimentBranchMixinMultiFeature(TestCase):
                     "feature_config__id", flat=True
                 )
             ),
-            set([feature_config1.id, feature_config2.id]),
+            {feature_config1.id, feature_config2.id},
         )
 
         self.assertEqual(len(experiment.treatment_branches), 1)
@@ -495,5 +495,5 @@ class TestNimbusExperimentBranchMixinMultiFeature(TestCase):
                 .feature_values.all()
                 .values_list("feature_config__id", flat=True)
             ),
-            set([feature_config1.id, feature_config2.id]),
+            {feature_config1.id, feature_config2.id},
         )

app/experimenter/experiments/tests/api/v5/test_serializers/test_nimbus_experiment_csv_serializer.py

@@ -66,7 +66,7 @@ class TestNimbusExperimentCsvSerializer(TestCase):
                 "start_date": experiment.start_date,
                 "enrollment_duration": experiment.enrollment_duration,
                 "end_date": experiment.end_date,
-                "results_url": experiment.experiment_url + "results",
+                "results_url": f"{experiment.experiment_url}results",
                 "experiment_summary": experiment.experiment_url,
                 "rollout": experiment.is_rollout,
                 "hypothesis": experiment.hypothesis,

app/experimenter/experiments/tests/api/v5/test_serializers/test_nimbus_experiment_documentation_link_mixin.py

@@ -40,14 +40,13 @@ class TestNimbusExperimentDocumentationLinkMixin(TestCase):
         experiment = NimbusExperimentFactory.create(
             status=NimbusExperiment.Status.DRAFT,
         )
-        links_before = []
-        for link in experiment.documentation_links.all():
-            links_before.append(
+        links_before = [
             {
                 "title": link.title,
                 "link": link.link,
             }
-            )
+            for link in experiment.documentation_links.all()
+        ]
         data = {
             "public_description": "changed",
             "changelog_message": "test changelog message",
@@ -68,14 +67,13 @@ class TestNimbusExperimentDocumentationLinkMixin(TestCase):
         experiment = NimbusExperimentFactory.create(
             status=NimbusExperiment.Status.DRAFT,
         )
-        links_before = []
-        for link in experiment.documentation_links.all():
-            links_before.append(
+        links_before = [
             {
                 "title": link.title,
                 "link": link.link,
             }
-            )
+            for link in experiment.documentation_links.all()
+        ]
         data = {
             "public_description": "changed reference",
             "reference_branch": {

app/experimenter/experiments/tests/api/v6/test_serializers.py

@@ -166,7 +166,7 @@ class TestNimbusExperimentSerializer(TestCase):
             },
         )
 
-        self.assertEqual(set(feature_ids_data), set([feature1.slug, feature2.slug]))
+        self.assertEqual(set(feature_ids_data), {feature1.slug, feature2.slug})
 
         self.assertEqual(
             bucket_data,

app/experimenter/experiments/tests/factories.py

@@ -337,7 +337,7 @@ class NimbusExperimentFactory(factory.django.DjangoModelFactory):
             for project in extracted:
                 self.projects.add(project)
         else:
-            for i in range(3):
+            for _ in range(3):
                 self.projects.add(ProjectFactory.create())
 
     @factory.post_generation
@@ -456,8 +456,7 @@ class NimbusExperimentFactory(factory.django.DjangoModelFactory):
             if (
                 experiment.status == experiment.Status.COMPLETE
                 and experiment.status_next is None
-            ):
-                if end_date is not None:
+            ) and end_date is not None:
                 experiment._end_date = end_date
                 current_datetime = end_date
 
@@ -536,7 +535,7 @@ class NimbusBranchScreenshotFactory(factory.django.DjangoModelFactory):
     branch = factory.SubFactory(NimbusBranchFactory)
     description = factory.LazyAttribute(lambda o: faker.text())
     image = factory.LazyAttribute(
-        lambda o: SimpleUploadedFile(name="%s.png" % faker.slug(), content=TINY_PNG)
+        lambda o: SimpleUploadedFile(name=f"{faker.slug()}.png", content=TINY_PNG)
     )
 
     class Meta:

app/experimenter/experiments/tests/test_admin.py

@@ -250,10 +250,10 @@ class TestNimbusExperimentExport(TestCase):
             NimbusExperimentFactory.Lifecycles.ENDING_APPROVE_APPROVE
         )
         experiment.reference_branch = None
-        branches = []
-        for b in experiment.branches.all():
-            branches.append(dict(NimbusBranchChangeLogSerializer(b).data))
-
+        branches = [
+            dict(NimbusBranchChangeLogSerializer(b).data)
+            for b in experiment.branches.all()
+        ]
         changes = []
         num_changes = 3
         for _ in range(num_changes):

app/experimenter/jetstream/client.py

@@ -22,9 +22,12 @@ BRANCH_DATA = "branch_data"
 STATISTICS_FOLDER = "statistics"
 METADATA_FOLDER = "metadata"
 ERRORS_FOLDER = "errors"
-ALL_STATISTICS = set(
-    [Statistic.BINOMIAL, Statistic.MEAN, Statistic.COUNT, Statistic.PERCENT]
-)
+ALL_STATISTICS = {
+    Statistic.BINOMIAL,
+    Statistic.MEAN,
+    Statistic.COUNT,
+    Statistic.PERCENT,
+}
 
 
 class AnalysisWindow:
@@ -62,10 +65,10 @@ def get_results_metrics_map(
     # A mapping of metric label to relevant statistic. This is
     # used to see which statistic will be used for each metric.
     RESULTS_METRICS_MAP = {
-        Metric.RETENTION: set([Statistic.BINOMIAL]),
-        Metric.SEARCH: set([Statistic.MEAN]),
-        Metric.DAYS_OF_USE: set([Statistic.MEAN]),
-        Metric.USER_COUNT: set([Statistic.COUNT, Statistic.PERCENT]),
+        Metric.RETENTION: {Statistic.BINOMIAL},
+        Metric.SEARCH: {Statistic.MEAN},
+        Metric.DAYS_OF_USE: {Statistic.MEAN},
+        Metric.USER_COUNT: {Statistic.COUNT, Statistic.PERCENT},
     }
     primary_metrics_set = set()
     primary_outcome_metrics = list(
@@ -104,7 +107,7 @@ def get_results_metrics_map(
     other_metrics_map, other_metrics = get_other_metrics_names_and_map(
         data, RESULTS_METRICS_MAP
     )
-    RESULTS_METRICS_MAP.update(other_metrics_map)
+    RESULTS_METRICS_MAP |= other_metrics_map
 
     return RESULTS_METRICS_MAP, primary_metrics_set, other_metrics
 
@@ -138,7 +141,7 @@ def get_other_metrics_names_and_map(data, RESULTS_METRICS_MAP):
 
     # Turn other_metrics_map into the format needed
     # by get_result_metrics_map()
-    other_metrics_map = {k: set([v]) for k, v in other_metrics_map.items()}
+    other_metrics_map = {k: {v} for k, v in other_metrics_map.items()}
 
     return other_metrics_map, other_metrics_names
 

app/experimenter/jetstream/models.py

@@ -191,7 +191,6 @@ class ResultsObjectModelBase(BaseModel):
         super(ResultsObjectModelBase, self).__init__()
 
         for jetstream_data_point in data:
-            branch = jetstream_data_point.branch
             metric = jetstream_data_point.metric
             statistic = jetstream_data_point.statistic
 
@@ -210,6 +209,7 @@ class ResultsObjectModelBase(BaseModel):
             window_index = 1 if window == "overall" else jetstream_data_point.window_index
 
             if metric in result_metrics and statistic in result_metrics[metric]:
+                branch = jetstream_data_point.branch
                 branch_obj = getattr(self, branch)
                 branch_obj.is_control = experiment.reference_branch.slug == branch
                 group_obj = getattr(

app/experimenter/jetstream/tests/test_tasks.py

@@ -918,9 +918,11 @@ class TestFetchJetstreamDataTask(TestCase):
             def read(self):
                 if "metadata" in self.name:
                     return "{}"
-                if "errors" in self.name:
-                    return "[]"
-                return json.dumps(DAILY_DATA + SEGMENT_DATA)
+                return (
+                    "[]"
+                    if "errors" in self.name
+                    else json.dumps(DAILY_DATA + SEGMENT_DATA)
+                )
 
         def open_file(filename):
             return File(filename)
@@ -974,9 +976,7 @@ class TestFetchJetstreamDataTask(TestCase):
             def read(self):
                 if "metadata" in self.name:
                     return "{}"
-                if "errors" in self.name:
-                    return "[]"
-                return json.dumps(DAILY_DATA)
+                return "[]" if "errors" in self.name else json.dumps(DAILY_DATA)
 
         def open_file(filename):
             return File(filename)

app/experimenter/kinto/tasks.py

@@ -67,9 +67,7 @@ def nimbus_check_kinto_push_queue_by_collection(collection):
     should_rollback = False
     if kinto_client.has_pending_review():
         logger.info(f"{collection} has pending review")
-        should_abort = handle_pending_review(applications)
-
-        if should_abort:
+        if should_abort := handle_pending_review(applications):
             return
 
         should_rollback = True
@@ -105,9 +103,7 @@ def nimbus_check_kinto_push_queue_by_collection(collection):
 
 
 def handle_pending_review(applications):
-    experiment = NimbusExperiment.objects.waiting(applications).first()
-
-    if experiment:
+    if experiment := NimbusExperiment.objects.waiting(applications).first():
         if experiment.should_timeout:
             experiment.publish_status = NimbusExperiment.PublishStatus.REVIEW
             experiment.save()
@@ -126,9 +122,7 @@ def handle_pending_review(applications):
 
 def handle_rejection(applications, kinto_client):
     collection_data = kinto_client.get_rejected_collection_data()
-    experiment = NimbusExperiment.objects.waiting(applications).first()
-
-    if experiment:
+    if experiment := NimbusExperiment.objects.waiting(applications).first():
         experiment.publish_status = NimbusExperiment.PublishStatus.IDLE
         experiment.status_next = None
         experiment.is_paused = False

app/experimenter/legacy/bugzilla/client.py

@@ -128,11 +128,11 @@ def make_bugzilla_call(url, method, data=None):
         response = method(url, data)
         return response.json()
     except requests.exceptions.RequestException as e:
-        logging.exception("Error calling Bugzilla API: {}".format(e))
-        raise BugzillaError(*e.args)
+        logging.exception(f"Error calling Bugzilla API: {e}")
+        raise BugzillaError(*e.args) from e
     except ValueError as e:
-        logging.exception("Error parsing JSON Bugzilla response: {}".format(e))
-        raise BugzillaError(*e.args)
+        logging.exception(f"Error parsing JSON Bugzilla response: {e}")
+        raise BugzillaError(*e.args) from e
 
 
 def format_creation_bug_body(experiment, extra_fields):
@@ -150,13 +150,13 @@ def format_creation_bug_body(experiment, extra_fields):
         "priority": "P3",
         "url": experiment.experiment_url,
     }
-    bug_data.update(extra_fields)
+    bug_data |= extra_fields
     return bug_data
 
 
 def format_summary(experiment):
 
-    truncated_name = experiment.name[0:EXPERIMENT_NAME_MAX_LEN]
+    truncated_name = experiment.name[:EXPERIMENT_NAME_MAX_LEN]
 
     if truncated_name != experiment.name:
         truncated_name += "..."
@@ -188,9 +188,7 @@ def format_normandy_experiment_request(experiment):
 
     extra_fields = {"assigned_to": assigned_to, "blocks": blocks}
 
-    bug_data = format_creation_bug_body(experiment, extra_fields)
-
-    return bug_data
+    return format_creation_bug_body(experiment, extra_fields)
 
 
 def get_bugzilla_id(bug_url):

app/experimenter/legacy/bugzilla/tasks.py

@@ -127,9 +127,7 @@ def add_start_date_comment_task(experiment_id):
     experiment = Experiment.objects.get(id=experiment_id)
     metrics.incr("add_start_data_comment.started")
     logger.info("Adding Bugzilla Start Date Comment")
-    comment = "Start Date: {} End Date: {}".format(
-        experiment.start_date, experiment.end_date
-    )
+    comment = f"Start Date: {experiment.start_date} End Date: {experiment.end_date}"
     try:
         bugzilla_id = experiment.bugzilla_id
         bugzilla.add_experiment_comment(bugzilla_id, comment)

app/experimenter/legacy/bugzilla/tests/test_bugzilla.py

@@ -257,9 +257,7 @@ class TestAddExperimentComment(MockBugzillaMixin, TestCase):
             bugzilla_id="123",
             type=Experiment.TYPE_PREF,
         )
-        comment = "Start Date: {} End Date: {}".format(
-            experiment.start_date, experiment.end_date
-        )
+        comment = f"Start Date: {experiment.start_date} End Date: {experiment.end_date}"
 
         comment_id = add_experiment_comment(experiment.bugzilla_id, comment)
 
@@ -278,9 +276,7 @@ class TestAddExperimentComment(MockBugzillaMixin, TestCase):
             type=Experiment.TYPE_ADDON,
         )
 
-        comment = "Start Date: {} End Date: {}".format(
-            experiment.start_date, experiment.end_date
-        )
+        comment = f"Start Date: {experiment.start_date} End Date: {experiment.end_date}"
 
         comment_id = add_experiment_comment(experiment.bugzilla_id, comment)
 

app/experimenter/legacy/bugzilla/tests/test_tasks.py

@@ -299,9 +299,7 @@ class TestUpdateTask(MockRequestMixin, MockBugzillaMixin, TestCase):
 class TestUpdateExperimentSubTask(MockNormandyMixin, MockBugzillaMixin, TestCase):
     def test_add_start_date_comment_task(self):
         experiment = ExperimentFactory.create(normandy_id=12345)
-        comment = "Start Date: {} End Date: {}".format(
-            experiment.start_date, experiment.end_date
-        )
+        comment = f"Start Date: {experiment.start_date} End Date: {experiment.end_date}"
         expected_call_data = {"comment": comment}
 
         tasks.add_start_date_comment_task(experiment.id)

app/experimenter/legacy/legacy_experiments/api/v1/serializers.py

@@ -20,10 +20,7 @@ class JSTimestampField(serializers.Field):
     """
 
     def to_representation(self, obj):
-        if obj:
-            return time.mktime(obj.timetuple()) * 1000
-        else:
-            return None
+        return time.mktime(obj.timetuple()) * 1000 if obj else None
 
 
 class PrefTypeField(serializers.Field):

app/experimenter/legacy/legacy_experiments/api/v2/serializers.py

@@ -34,22 +34,23 @@ class PrefValidationMixin(object):
         if pref_type == "Firefox Pref Type":
             errors["pref_type"] = "Please select a pref type"
 
-        pref_value_error = self.validate_pref_value(pref_type, pref_value, field_name)
-        if pref_value_error:
+        if pref_value_error := self.validate_pref_value(
+            pref_type, pref_value, field_name
+        ):
             errors[field_name] = pref_value_error
         return errors
 
     def validate_pref_value(self, pref_type, pref_value, field_name):
-        if pref_type == "integer":
+        if pref_type == "boolean":
+            if pref_value not in ["true", "false"]:
+                return {field_name: "The pref value must be a boolean."}
+
+        elif pref_type == "integer":
             try:
                 int(pref_value)
             except ValueError:
                 return {field_name: "The pref value must be an integer."}
 
-        if pref_type == "boolean":
-            if pref_value not in ["true", "false"]:
-                return {field_name: "The pref value must be a boolean."}
-
         if pref_type == "json string":
             try:
                 json.loads(pref_value)
@@ -58,17 +59,15 @@ class PrefValidationMixin(object):
         return {}
 
     def is_pref_valid(self, preferences):
-        unique_names = len(
-            set([slugify(pref["pref_name"]) for pref in preferences])
-        ) == len(preferences)
-
-        return unique_names
+        return len({slugify(pref["pref_name"]) for pref in preferences}) == len(
+            preferences
+        )
 
 
 class VariantsListSerializer(serializers.ListSerializer):
     def to_representation(self, data):
         data = super().to_representation(data)
-        initial_fields = set(self.child.fields) - set(["id"])
+        initial_fields = set(self.child.fields) - {"id"}
 
         if data == []:
             blank_variant = {}
@@ -127,9 +126,7 @@ class ExperimentDesignVariantPrefSerializer(ExperimentDesignVariantBaseSerialize
 class PreferenceListSerializer(serializers.ListSerializer):
     def to_representation(self, data):
         data = super().to_representation(data)
-        if data == []:
-            return [{}]
-        return data
+        return [{}] if data == [] else data
 
 
 class ExperimentDesignBasePreferenceSerializer(serializers.ModelSerializer):
@@ -184,7 +181,7 @@ class ExperimentDesignBranchMultiPrefSerializer(
         error_list = []
         for pref in preferences:
             errors = {}
-            errors.update(self.validate_pref_branch(pref["pref_branch"]))
+            errors |= self.validate_pref_branch(pref["pref_branch"])
             errors.update(self.validate_multi_preference(pref))
             error_list.append(errors)
 
@@ -202,23 +199,17 @@ class ExperimentDesignBaseSerializer(
         fields = ("variants",)
 
     def validate(self, data):
-        variants = data.get("variants")
-
-        if variants:
-            if sum([variant["ratio"] for variant in variants]) != 100:
-                error_list = []
-                for variant in variants:
-                    error_list.append({"ratio": ["All branch sizes must add up to 100."]})
-
+        if variants := data.get("variants"):
+            if sum(variant["ratio"] for variant in variants) != 100:
+                error_list = [
+                    {"ratio": ["All branch sizes must add up to 100."]} for _ in variants
+                ]
                 raise serializers.ValidationError({"variants": error_list})
 
             if not self.is_variant_valid(variants):
-                error_list = []
-                for variant in variants:
-                    error_list.append(
-                        {"name": [("All branches must have a unique name")]}
-                    )
-
+                error_list = [
+                    {"name": [("All branches must have a unique name")]} for _ in variants
+                ]
                 raise serializers.ValidationError({"variants": error_list})
 
         return data
@@ -248,22 +239,20 @@ class ExperimentDesignBaseSerializer(
                     ExperimentVariant(**variant_data).save()
 
                 # Delete removed variants
-                submitted_variant_ids = set(
-                    [v.get("id") for v in variants_data if v.get("id")]
-                )
-                removed_ids = existing_variant_ids - submitted_variant_ids
-
-                if removed_ids:
+                submitted_variant_ids = {
+                    v.get("id") for v in variants_data if v.get("id")
+                }
+                if removed_ids := existing_variant_ids - submitted_variant_ids:
                     ExperimentVariant.objects.filter(id__in=removed_ids).delete()
 
             return instance
-        except IntegrityError:
+        except IntegrityError as e:
             error_string = (
                 "Error: unable to save this change, please contact an experimenter admin"
             )
             error = [{"name": error_string}] * len(variants_data)
 
-            raise serializers.ValidationError({"variants": error})
+            raise serializers.ValidationError({"variants": error}) from e
 
     def update(self, instance, validated_data):
         instance = self.update_instance(instance, validated_data)
@@ -334,9 +323,7 @@ class ExperimentDesignPrefRolloutSerializer(
                     id=pref_id, defaults=preference_data
                 )
 
-            removed_ids = existing_preference_ids - set(submitted_preference_ids)
-
-            if removed_ids:
+            if removed_ids := existing_preference_ids - set(submitted_preference_ids):
                 RolloutPreference.objects.filter(id__in=removed_ids).delete()
 
         self.update_changelog(instance, validated_data_copy)
@@ -381,9 +368,7 @@ class ExperimentDesignMultiPrefSerializer(ExperimentDesignBaseSerializer):
                     pref_id = pref.get("id")
                     submitted_pref_ids.append(pref_id)
 
-        removed_ids = set(existing_pref_ids) - set(submitted_pref_ids)
-
-        if removed_ids:
+        if removed_ids := set(existing_pref_ids) - set(submitted_pref_ids):
             VariantPreferences.objects.filter(id__in=removed_ids).delete()
 
         self.update_changelog(instance, validated_data)
@@ -424,22 +409,18 @@ class ExperimentDesignPrefSerializer(PrefValidationMixin, ExperimentDesignBaseSe
 
         variants = data["variants"]
 
-        if not len(set(variant["value"] for variant in variants)) == len(variants):
-            error_list = []
-            for variant in variants:
-                error_list.append(
+        if len({variant["value"] for variant in variants}) != len(variants):
+            error_list = [
                 {"value": ["All branches must have a unique pref value."]}
-                )
-
+                for _ in variants
+            ]
             raise serializers.ValidationError({"variants": error_list})
 
-        error_list = []
         pref_type = data.get("pref_type", "")
-        for variant in variants:
-            error_list.append(
+        error_list = [
             self.validate_pref_value(pref_type, variant["value"], "value")
-            )
-
+            for variant in variants
+        ]
         if any(error_list):
             raise serializers.ValidationError({"variants": error_list})
         return data
@@ -658,8 +639,11 @@ class ExperimentTimelinePopSerializer(
     def validate(self, data):
         data = super().validate(data)
 
-        if data["proposed_enrollment"] and data["proposed_duration"]:
-            if data["proposed_enrollment"] >= data["proposed_duration"]:
+        if (
+            data["proposed_enrollment"]
+            and data["proposed_duration"]
+            and data["proposed_enrollment"] >= data["proposed_duration"]
+        ):
             raise serializers.ValidationError(
                 {
                     "proposed_enrollment": (
@@ -672,8 +656,11 @@ class ExperimentTimelinePopSerializer(
                 }
             )
 
-        if data["firefox_min_version"] and data["firefox_max_version"]:
-            if float(data["firefox_min_version"]) > float(data["firefox_max_version"]):
+        if (
+            data["firefox_min_version"]
+            and data["firefox_max_version"]
+            and float(data["firefox_min_version"]) > float(data["firefox_max_version"])
+        ):
             raise serializers.ValidationError(
                 {
                     "firefox_max_version": (
@@ -717,11 +704,9 @@ class ExperimentCloneSerializer(serializers.ModelSerializer):
         fields = ("name", "clone_url")
 
     def validate_name(self, value):
-        existing_slug_or_name = Experiment.objects.filter(
+        if existing_slug_or_name := Experiment.objects.filter(
             Q(slug=slugify(value)) | Q(name=value)
-        )
-
-        if existing_slug_or_name:
+        ):
             raise serializers.ValidationError("This experiment name already exists.")
 
         if slugify(value):

app/experimenter/legacy/legacy_experiments/api/v2/views.py

@@ -108,7 +108,7 @@ class ExperimentTimelinePopulationView(RetrieveUpdateAPIView):
 
 class ExperimentCSVRenderer(CSVRenderer):
     header = ExperimentCSVSerializer.Meta.fields
-    labels = dict(((field, field.replace("_", " ").title()) for field in header))
+    labels = {field: field.replace("_", " ").title() for field in header}
 
 
 class ExperimentCSVListView(ListAPIView):

app/experimenter/legacy/legacy_experiments/changelog_utils.py

@@ -233,8 +233,8 @@ def generate_change_log(
                     }
 
         else:
-            for field in changed_data:
             old_val = None
+            for field in changed_data:
                 new_val = None
                 if field in new_serialized_vals:
                     if field in ("countries", "locales"):

app/experimenter/legacy/legacy_experiments/constants.py

@@ -24,7 +24,7 @@ class ExperimentConstants(object):
 
     @classmethod
     def FEATURE_TYPE_CHOICES(cls):  # pragma: no cover
-        choices = (
+        return (
             (cls.TYPE_PREF, "Pref-Flip Experiment"),
             (cls.TYPE_ADDON, "Add-On Experiment"),
             (cls.TYPE_GENERIC, "Generic Experiment"),
@@ -32,8 +32,6 @@ class ExperimentConstants(object):
             (cls.TYPE_MESSAGE, "Message Router Content Experiment"),
         )
 
-        return choices
-
     # Message stuff
     MESSAGE_DEFAULT_LOCALES = ("en-AU", "en-GB", "en-CA", "en-NZ", "en-ZA", "en-US")
     MESSAGE_DEFAULT_COUNTRIES = ("US", "CA", "GB", "DE", "FR")

app/experimenter/legacy/legacy_experiments/email.py

@@ -135,19 +135,22 @@ def format_and_send_html_email(
 
 def send_period_ending_emails_task(experiment):
     # send experiment ending soon emails if end date is 5 days out
-    if experiment.ending_soon:
-        if not ExperimentEmail.objects.filter(
+    if (
+        experiment.ending_soon
+        and not ExperimentEmail.objects.filter(
             experiment=experiment, type=ExperimentConstants.EXPERIMENT_ENDS
-        ).exists():
+        ).exists()
+    ):
         send_experiment_ending_email(experiment)
-            logging.info("Sent ending email for Experiment: {}".format(experiment))
+        logging.info(f"Sent ending email for Experiment: {experiment}")
     # send enrollment ending emails if enrollment end
     # date is 5 days out
-    if experiment.enrollment_end_date and experiment.enrollment_ending_soon:
-        if not ExperimentEmail.objects.filter(
+    if (
+        experiment.enrollment_end_date
+        and experiment.enrollment_ending_soon
+        and not ExperimentEmail.objects.filter(
             experiment=experiment, type=ExperimentConstants.EXPERIMENT_PAUSES
-        ).exists():
+        ).exists()
+    ):
         send_enrollment_pause_email(experiment)
-            logging.info(
-                "Sent enrollment pause email for Experiment: {}".format(experiment)
-            )
+        logging.info(f"Sent enrollment pause email for Experiment: {experiment}")

app/experimenter/legacy/legacy_experiments/filtersets.py

@@ -182,9 +182,7 @@ class ExperimentFilterset(filters.FilterSet):
         )
 
     def archived_filter(self, queryset, name, value):
-        if not value:
-            return queryset.exclude(archived=True)
-        return queryset
+        return queryset if value else queryset.exclude(archived=True)
 
     def experiment_date_field_filter(self, queryset, name, value):
         # this custom method isn't doing anything. There has to
@@ -199,8 +197,8 @@ class ExperimentFilterset(filters.FilterSet):
         )
 
     def date_range_filter(self, queryset, name, value):
-        date_type = self.form.cleaned_data["experiment_date_field"]
-        if date_type:
+        if not (date_type := self.form.cleaned_data["experiment_date_field"]):
+            return queryset
         experiment_date_field = {
             Experiment.EXPERIMENT_STARTS: "start_date",
             Experiment.EXPERIMENT_PAUSES: "enrollment_end_date",
@@ -210,11 +208,7 @@ class ExperimentFilterset(filters.FilterSet):
         results = []
 
         for experiment in queryset.all():
-                date = getattr(experiment, experiment_date_field)
-
-                # enrollment end dates are optional, so there won't always
-                # be a pause date for an experiment
-                if date:
+            if date := getattr(experiment, experiment_date_field):
                 if value.start and date < value.start.date():
                     continue
                 if value.stop and date > value.stop.date():
@@ -222,7 +216,6 @@ class ExperimentFilterset(filters.FilterSet):
                 results.append(experiment.id)
 
         return queryset.filter(pk__in=results)
-        return queryset
 
     def in_qa_filter(self, queryset, name, value):
         if value:
@@ -231,10 +224,7 @@ class ExperimentFilterset(filters.FilterSet):
         return queryset
 
     def surveys_filter(self, queryset, name, value):
-        if value:
-            return queryset.filter(survey_required=True)
-
-        return queryset
+        return queryset.filter(survey_required=True) if value else queryset
 
     def subscribed_filter(self, queryset, name, value):
         if value:
@@ -294,15 +284,12 @@ class ExperimentFilterset(filters.FilterSet):
         )
 
     def get_project_display_value(self):
-        project_ids = self.data.getlist("projects")
-
-        if project_ids:
+        if project_ids := self.data.getlist("projects"):
             if "null" in project_ids:
                 project_ids.remove("null")
-            project_name_list = Project.objects.filter(id__in=project_ids).values_list(
-                "name"
-            )
-            if project_name_list:
+            if project_name_list := Project.objects.filter(
+                id__in=project_ids
+            ).values_list("name"):
                 return ", ".join(project_name[0] for project_name in project_name_list)
             return "No Projects"
 

app/experimenter/legacy/legacy_experiments/forms.py

@@ -32,8 +32,8 @@ class JSONField(forms.CharField):
         if cleaned_value:
             try:
                 json.loads(cleaned_value)
-            except json.JSONDecodeError:
-                raise forms.ValidationError("This is not valid JSON.")
+            except json.JSONDecodeError as e:
+                raise forms.ValidationError("This is not valid JSON.") from e
 
         return cleaned_value
 
@@ -43,16 +43,16 @@ class DSIssueURLField(forms.URLField):
         cleaned_value = super().clean(value)
 
         if cleaned_value:
-            err_str = (
-                "Please Provide a Valid URL ex: {ds_url}DS-12345 or {ds_url}DO-12345"
-            )
-
             ds = re.match(
                 re.escape(settings.DS_ISSUE_HOST) + r"(DS|DO)-(\w+.*)", cleaned_value
             )
 
             if ds is None:
 
+                err_str = (
+                    "Please Provide a Valid URL ex: {ds_url}DS-12345 or {ds_url}DO-12345"
+                )
+
                 raise forms.ValidationError(err_str.format(ds_url=settings.DS_ISSUE_HOST))
         return cleaned_value
 
@@ -61,12 +61,11 @@ class BugzillaURLField(forms.URLField):
     def clean(self, value):
         cleaned_value = super().clean(value)
 
-        if cleaned_value:
-            err_str = "Please Provide a Valid URL ex: {}show_bug.cgi?id=1234"
-            if (
+        if cleaned_value and (
             settings.BUGZILLA_HOST not in cleaned_value
             or get_bugzilla_id(cleaned_value) is None
         ):
+            err_str = "Please Provide a Valid URL ex: {}show_bug.cgi?id=1234"
             raise forms.ValidationError(err_str.format(settings.BUGZILLA_HOST))
 
         return cleaned_value
@@ -678,7 +677,7 @@ class ExperimentReviewForm(ExperimentConstants, ChangeLogMixin, forms.ModelForm)
         reviews = set(self.fields) - set(self.instance.get_all_required_reviews())
 
         if self.instance.is_rollout:
-            reviews -= set(["review_science", "review_bugzilla", "review_engineering"])
+            reviews -= {"review_science", "review_bugzilla", "review_engineering"}
 
         return [self[r] for r in sorted(reviews)]
 
@@ -819,10 +818,7 @@ class ExperimentArchiveForm(ExperimentConstants, ChangeLogMixin, forms.ModelForm
         return not self.instance.archived
 
     def get_changelog_message(self):
-        message = "Archived Delivery"
-        if not self.instance.archived:
-            message = "Unarchived Delivery"
-        return message
+        return "Archived Delivery" if self.instance.archived else "Unarchived Delivery"
 
     def save(self, *args, **kwargs):
         experiment = Experiment.objects.get(id=self.instance.id)
@@ -923,8 +919,8 @@ class NormandyIdForm(ChangeLogMixin, forms.ModelForm):
             return [
                 int(i.strip()) for i in self.cleaned_data["other_normandy_ids"].split(",")
             ]
-        except ValueError:
-            raise forms.ValidationError("IDs must be numbers separated by commas.")
+        except ValueError as e:
+            raise forms.ValidationError("IDs must be numbers separated by commas.") from e
 
     class Meta:
         model = Experiment

app/experimenter/legacy/legacy_experiments/models.py

@@ -378,13 +378,13 @@ class Experiment(ExperimentConstants, models.Model):
 
     @property
     def format_ndt_normandy_urls(self):
+        urls = []
+
+        if self.normandy_id:
             # returns a list of dictionaries containing D.C. and Normandy
             # urls for the main normandy id and other normandy ids if they exist
             normandy_recipe_url = settings.NORMANDY_API_RECIPE_URL
             ndt_recipe_url = settings.NORMANDY_DEVTOOLS_RECIPE_URL
-        urls = []
-
-        if self.normandy_id:
             urls.append(
                 {
                     "id": self.normandy_id,
@@ -394,15 +394,14 @@ class Experiment(ExperimentConstants, models.Model):
             )
 
             if self.other_normandy_ids:
-                for norm_id in self.other_normandy_ids:
-                    urls.append(
+                urls.extend(
                     {
                         "id": norm_id,
                         "normandy_url": normandy_recipe_url.format(id=norm_id),
                         "ndt_url": ndt_recipe_url.format(id=norm_id),
                     }
+                    for norm_id in self.other_normandy_ids
                 )
-
         return urls
 
     @property
@@ -460,8 +459,7 @@ class Experiment(ExperimentConstants, models.Model):
 
     @property
     def enrollment_end_date(self):
-        changes = self.changes.filter(message="Enrollment Complete")
-        if changes:
+        if changes := self.changes.filter(message="Enrollment Complete"):
             return changes[0].changed_on.date()
         if self.proposed_enrollment:
             return self._compute_end_date(self.proposed_enrollment)
@@ -473,22 +471,15 @@ class Experiment(ExperimentConstants, models.Model):
     @property
     def observation_duration(self):
         if self.enrollment_end_date:
-            duration = (self.end_date - self.enrollment_end_date).days
-            return duration
+            return (self.end_date - self.enrollment_end_date).days
         return 0
 
     def _format_date(self, date):
         return date.strftime("%b %d, %Y")
 
     def _format_date_string(self, start_date, end_date):
-        start_text = "Unknown"
-        if start_date:
-            start_text = self._format_date(start_date)
-
-        end_text = "Unknown"
-        if end_date:
-            end_text = self._format_date(end_date)
-
+        start_text = self._format_date(start_date) if start_date else "Unknown"
+        end_text = self._format_date(end_date) if end_date else "Unknown"
         day_text = "days"
         duration_text = "Unknown"
         if start_date and end_date:
@@ -558,10 +549,10 @@ class Experiment(ExperimentConstants, models.Model):
         date_ordered_changes = []
         for date, users in sorted(self.grouped_changes.items(), reverse=True):
 
-            date_changes = []
-            for user, user_changes in users.items():
-                date_changes.append((user, set([c for c in list(user_changes)])))
-
+            date_changes = [
+                (user, set(list(list(user_changes))))
+                for user, user_changes in users.items()
+            ]
             date_ordered_changes.append((date, date_changes))
 
         return date_ordered_changes
@@ -634,7 +625,6 @@ class Experiment(ExperimentConstants, models.Model):
     def display_platforms_or_versions(self):
         if self.windows_versions:
             return ", ".join(self.windows_versions)
-        else:
         if set(ExperimentConstants.PLATFORMS_LIST) == set(self.platforms):
             return ExperimentConstants.PLATFORM_ALL
 
@@ -684,7 +674,7 @@ class Experiment(ExperimentConstants, models.Model):
     @property
     def completed_addon(self):
         if self.is_branched_addon:
-            return all([v.addon_release_url for v in self.variants.all()])
+            return all(v.addon_release_url for v in self.variants.all())
         else:
             return self.addon_release_url
 
@@ -721,7 +711,7 @@ class Experiment(ExperimentConstants, models.Model):
             "results_impact_notes",
         )
 
-        return any([getattr(self, field) for field in results_fields])
+        return any(getattr(self, field) for field in results_fields)
 
     @property
     def additional_results(self):
@@ -840,7 +830,7 @@ class Experiment(ExperimentConstants, models.Model):
             # review advisory is an exception that is not required
             required_reviews.remove("review_advisory")
 
-        return all([getattr(self, r) for r in required_reviews])
+        return all(getattr(self, r) for r in required_reviews)
 
     @property
     def completed_all_sections(self):
@@ -1073,10 +1063,7 @@ class ExperimentVariant(models.Model):
 
     @property
     def type(self):
-        if self.is_control:
-            return "Control"
-        else:
-            return "Treatment"
+        return "Control" if self.is_control else "Treatment"
 
 
 class Preference(models.Model):
@@ -1207,10 +1194,7 @@ class ExperimentChangeLog(models.Model):
         ordering = ("changed_on",)
 
     def __str__(self):
-        if self.message:
-            return self.message
-        else:
-            return self.pretty_status
+        return self.message or self.pretty_status
 
     @property
     def pretty_status(self):

app/experimenter/legacy/legacy_experiments/templatetags/experiment_extras.py

@@ -39,10 +39,7 @@ def pagination_url(context, page, **kwargs):
         data.pop("page", None)
     else:
         data["page"] = page
-    if data:
-        return f"?{data.urlencode()}"
-    else:
-        return "."
+    return f"?{data.urlencode()}" if data else "."
 
 
 @register.filter

app/experimenter/legacy/legacy_experiments/tests/api/v1/test_views.py

@@ -18,7 +18,7 @@ class TestExperimentListView(TestCase):
     def test_list_view_serializes_experiments(self):
         experiments = []
 
-        for i in range(3):
+        for _ in range(3):
             experiment = ExperimentFactory.create_with_variants()
             experiments.append(experiment)
 
@@ -37,11 +37,11 @@ class TestExperimentListView(TestCase):
         pending_experiments = []
 
         # new experiments should be excluded
-        for i in range(2):
+        for _ in range(2):
             ExperimentFactory.create_with_variants()
 
         # pending experiments should be included
-        for i in range(3):
+        for _ in range(3):
             experiment = ExperimentFactory.create_with_variants()
             experiment.status = experiment.STATUS_REVIEW
             experiment.save()

app/experimenter/legacy/legacy_experiments/tests/api/v2/test_serializers.py

@@ -57,13 +57,13 @@ class TestExperimentDesignVariantBaseSerializer(TestCase):
     def test_serializer_puts_control_branch_first_and_sorts_rest_by_id(self):
         ExperimentVariantFactory.create(is_control=True)
         sorted_treatment_ids = sorted(
-            [ExperimentVariantFactory.create(is_control=False).id for i in range(3)]
+            [ExperimentVariantFactory.create(is_control=False).id for _ in range(3)]
         )
         serializer = ExperimentDesignVariantBaseSerializer(
             ExperimentVariant.objects.all().order_by("-id"), many=True
         )
         self.assertTrue(serializer.data[0]["is_control"])
-        self.assertFalse(any([b["is_control"] for b in serializer.data[1:]]))
+        self.assertFalse(any(b["is_control"] for b in serializer.data[1:]))
         self.assertEqual(sorted_treatment_ids, [b["id"] for b in serializer.data[1:]])
 
 
@@ -496,7 +496,7 @@ class TestExperimentDesignBaseSerializer(MockRequestMixin, TestCase):
 
         self.assertEqual(experiment.variants.all().count(), 2)
         self.assertEqual(
-            set(experiment.variants.all()), set([control_variant, treatment2_variant])
+            set(experiment.variants.all()), {control_variant, treatment2_variant}
         )
 
     def test_serializer_adds_new_variant(self):
@@ -543,7 +543,7 @@ class TestExperimentDesignBaseSerializer(MockRequestMixin, TestCase):
         new_variant = ExperimentVariant.objects.get(name=treatment2_variant_data["name"])
         self.assertEqual(
             set(experiment.variants.all()),
-            set([control_variant, treatment1_variant, new_variant]),
+            {control_variant, treatment1_variant, new_variant},
         )
 
     def test_serializer_rejects_ratio_not_100(self):
@@ -756,7 +756,7 @@ class TestExperimentDesignPrefSerializer(MockRequestMixin, TestCase):
         serializer = ExperimentDesignPrefSerializer(instance=experiment, data=data)
 
         self.assertFalse(serializer.is_valid())
-        self.assertEqual(set(serializer.errors), set(["pref_type"]))
+        self.assertEqual(set(serializer.errors), {"pref_type"})
         experiment = Experiment.objects.get(id=experiment.id)
         self.assertEqual(experiment.changes.count(), 0)
 
@@ -773,7 +773,7 @@ class TestExperimentDesignPrefSerializer(MockRequestMixin, TestCase):
         serializer = ExperimentDesignPrefSerializer(instance=experiment, data=data)
 
         self.assertFalse(serializer.is_valid())
-        self.assertEqual(set(serializer.errors), set(["pref_branch"]))
+        self.assertEqual(set(serializer.errors), {"pref_branch"})
 
     def test_serializer_rejects_inconsistent_pref_type_bool(self):
         experiment = ExperimentFactory.create(type=ExperimentConstants.TYPE_PREF)

app/experimenter/legacy/legacy_experiments/tests/factories.py

@@ -209,7 +209,7 @@ class ExperimentFactory(ExperimentConstants, factory.django.DjangoModelFactory):
             return
 
         if extracted is None:
-            extracted = [ProjectFactory.create() for i in range(3)]
+            extracted = [ProjectFactory.create() for _ in range(3)]
 
         self.projects.add(*extracted)
 
@@ -225,7 +225,7 @@ class BaseExperimentVariantFactory(factory.django.DjangoModelFactory):
 
     @factory.lazy_attribute
     def addon_release_url(self):
-        return "https://www.example.com/{}-release.xpi".format(slugify(self.name))
+        return f"https://www.example.com/{slugify(self.name)}-release.xpi"
 
     class Meta:
         model = ExperimentVariant

app/experimenter/legacy/legacy_experiments/tests/test_email.py

@@ -55,14 +55,12 @@ class TestIntentToShipEmail(TestCase):
         self.assertEqual(sent_email.from_email, sender)
         self.assertEqual(
             set(sent_email.recipients()),
-            set(
-                [
+            {
                 release_drivers,
                 experiment.owner.email,
                 experiment.analysis_owner,
                 "smith@example.com",
-                ]
-            ),
+            },
         )
         self.assertTrue(
             experiment.emails.filter(
@@ -116,14 +114,12 @@ class TestIntentToShipEmail(TestCase):
         self.assertEqual(sent_email.from_email, sender)
         self.assertEqual(
             set(sent_email.recipients()),
-            set(
-                [
+            {
                 release_drivers,
                 experiment.owner.email,
                 experiment.analysis_owner,
                 "smith@example.com",
-                ]
-            ),
+            },
         )
 
     def format_locales(self, experiment):

app/experimenter/legacy/legacy_experiments/tests/test_filtersets.py

@@ -28,7 +28,7 @@ class TestExperimentFilterset(MockRequestMixin, TestCase):
             queryset=Experiment.objects.all(),
         )
         self.assertTrue(filter.is_valid())
-        self.assertEqual(set(filter.qs), set([pref, addon]))
+        self.assertEqual(set(filter.qs), {pref, addon})
         self.assertEqual(filter.get_type_display_value(), "Pref-Flip, Add-On")
 
     def test_filters_by_no_project_type(self):
@@ -65,10 +65,10 @@ class TestExperimentFilterset(MockRequestMixin, TestCase):
         self.assertIn(project2.name, display_value)
 
     def test_filters_out_archived_by_default(self):
-        for i in range(3):
+        for _ in range(3):
             ExperimentFactory.create_with_status(Experiment.STATUS_DRAFT, archived=False)
 
-        for i in range(3):
+        for _ in range(3):
             ExperimentFactory.create_with_status(Experiment.STATUS_DRAFT, archived=True)
 
         filter = ExperimentFilterset(data={}, queryset=Experiment.objects.all())
@@ -76,10 +76,10 @@ class TestExperimentFilterset(MockRequestMixin, TestCase):
         self.assertEqual(set(filter.qs), set(Experiment.objects.filter(archived=False)))
 
     def test_allows_archived_if_True(self):
-        for i in range(3):
+        for _ in range(3):
             ExperimentFactory.create_with_status(Experiment.STATUS_DRAFT, archived=False)
 
-        for i in range(3):
+        for _ in range(3):
             ExperimentFactory.create_with_status(Experiment.STATUS_DRAFT, archived=True)
 
         filter = ExperimentFilterset(
@@ -91,7 +91,7 @@ class TestExperimentFilterset(MockRequestMixin, TestCase):
     def test_filters_by_owner(self):
         owner = UserFactory.create()
 
-        for i in range(3):
+        for _ in range(3):
             ExperimentFactory.create_with_status(Experiment.STATUS_DRAFT, owner=owner)
             ExperimentFactory.create_with_status(Experiment.STATUS_DRAFT)
 
@@ -103,7 +103,7 @@ class TestExperimentFilterset(MockRequestMixin, TestCase):
         self.assertEqual(filter.get_owner_display_value(), str(owner))
 
     def test_filters_by_status(self):
-        for i in range(3):
+        for _ in range(3):
             ExperimentFactory.create_with_status(Experiment.STATUS_DRAFT)
             ExperimentFactory.create_with_status(Experiment.STATUS_REVIEW)
 
@@ -136,13 +136,13 @@ class TestExperimentFilterset(MockRequestMixin, TestCase):
         filter = ExperimentFilterset(
             {"firefox_version": "59.0"}, queryset=Experiment.objects.all()
         )
-        self.assertEqual(set(filter.qs), set([exp_1, exp_2, exp_3]))
+        self.assertEqual(set(filter.qs), {exp_1, exp_2, exp_3})
 
     def test_filters_by_firefox_channel(self):
         include_channel = Experiment.CHANNEL_CHOICES[1][0]
         exclude_channel = Experiment.CHANNEL_CHOICES[2][0]
 
-        for i in range(3):
+        for _ in range(3):
             ExperimentFactory.create_with_variants(firefox_channel=include_channel)
             ExperimentFactory.create_with_variants(firefox_channel=exclude_channel)
 
@@ -219,8 +219,8 @@ class TestExperimentFilterset(MockRequestMixin, TestCase):
             **{settings.OPENIDC_EMAIL_HEADER: user_email},
         ).context[0]
 
-        self.assertEqual(set(first_response_context["experiments"]), set([exp_1, exp_2]))
-        self.assertEqual(set(second_response_context["experiments"]), set([exp_3]))
+        self.assertEqual(set(first_response_context["experiments"]), {exp_1, exp_2})
+        self.assertEqual(set(second_response_context["experiments"]), {exp_3})
 
     def test_filters_by_review_in_qa(self):
         exp_1 = ExperimentFactory.create_with_variants(
@@ -231,7 +231,7 @@ class TestExperimentFilterset(MockRequestMixin, TestCase):
 
         filter = ExperimentFilterset({"in_qa": "on"}, queryset=Experiment.objects.all())
 
-        self.assertEqual(set(filter.qs), set([exp_1]))
+        self.assertEqual(set(filter.qs), {exp_1})
 
     def test_filters_experiments_with_surveys(self):
         exp_1 = ExperimentFactory.create_with_variants(survey_required=True)
@@ -242,7 +242,7 @@ class TestExperimentFilterset(MockRequestMixin, TestCase):
 
         filter = ExperimentFilterset({"surveys": "on"}, queryset=Experiment.objects.all())
 
-        self.assertEqual(set(filter.qs), set([exp_1, exp_2]))
+        self.assertEqual(set(filter.qs), {exp_1, exp_2})
 
     def test_filters_for_subscribed_experiments(self):
         exp_1 = ExperimentFactory.create(name="Experiment", slug="experiment")
@@ -288,7 +288,7 @@ class TestExperimentFilterset(MockRequestMixin, TestCase):
             {"longrunning": "on"}, request=self.request, queryset=Experiment.objects.all()
         )
 
-        self.assertEqual(set(filter.qs), set([exp_1, exp_2]))
+        self.assertEqual(set(filter.qs), {exp_1, exp_2})
 
     def test_filters_for_results_completed(self):
         exp1 = ExperimentFactory.create(results_url="https://example.com")
@@ -358,7 +358,7 @@ class TestExperimentFilterset(MockRequestMixin, TestCase):
             }
         )
 
-        self.assertEqual(set(filter.qs), set([self.exp_1]))
+        self.assertEqual(set(filter.qs), {self.exp_1})
         self.assertEqual(
             filter.get_display_start_date_info(),
             "starting between 2019-04-01 and 2019-05-01",
@@ -375,7 +375,7 @@ class TestExperimentFilterset(MockRequestMixin, TestCase):
             }
         )
 
-        self.assertEqual(set(filter.qs), set([self.exp_1, self.exp_2]))
+        self.assertEqual(set(filter.qs), {self.exp_1, self.exp_2})
         self.assertEqual(
             filter.get_display_start_date_info(),
             "pausing between 2019-04-01 and 2019-05-01",
@@ -392,7 +392,7 @@ class TestExperimentFilterset(MockRequestMixin, TestCase):
             }
         )
 
-        self.assertEqual(set(filter.qs), set([self.exp_2, self.exp_4]))
+        self.assertEqual(set(filter.qs), {self.exp_2, self.exp_4})
         self.assertEqual(
             filter.get_display_start_date_info(),
             "ending between 2019-04-01 and 2019-05-01",
@@ -409,7 +409,7 @@ class TestExperimentFilterset(MockRequestMixin, TestCase):
             }
         )
 
-        self.assertEqual(set(filter.qs), set([self.exp_1, self.exp_3]))
+        self.assertEqual(set(filter.qs), {self.exp_1, self.exp_3})
         self.assertEqual(
             filter.get_display_start_date_info(), "starting after 2019-04-01"
         )
@@ -425,7 +425,7 @@ class TestExperimentFilterset(MockRequestMixin, TestCase):
             }
         )
 
-        self.assertEqual(set(filter.qs), set([self.exp_1, self.exp_2, self.exp_4]))
+        self.assertEqual(set(filter.qs), {self.exp_1, self.exp_2, self.exp_4})
         self.assertEqual(
             filter.get_display_start_date_info(), "starting before 2019-05-01"
         )
@@ -441,15 +441,13 @@ class TestExperimentFilterset(MockRequestMixin, TestCase):
             }
         )
 
-        self.assertEqual(
-            set(filter.qs), set([self.exp_1, self.exp_2, self.exp_3, self.exp_4])
-        )
+        self.assertEqual(set(filter.qs), {self.exp_1, self.exp_2, self.exp_3, self.exp_4})
 
     def test_filters_by_analysis_owner(self):
         user = UserFactory.create()
         experiment = ExperimentFactory.create(analysis_owner=user)
         filter = ExperimentFilterset(data={"analysis_owner": user.id})
-        self.assertEqual(set(filter.qs), set([experiment]))
+        self.assertEqual(set(filter.qs), {experiment})
 
     def test_filter_by_analysis_owner_invalid_for_non_analysis_owner(self):
         user = UserFactory.create()

app/experimenter/legacy/legacy_experiments/tests/test_forms.py

@@ -684,9 +684,8 @@ class TestExperimentReviewForm(
         form = ExperimentReviewForm(request=self.request, data={}, instance=experiment)
 
         self.assertEqual(
-            set([f.name for f in form.required_reviews]),
-            set(
-                [
+            {f.name for f in form.required_reviews},
+            {
                 "review_science",
                 "review_advisory",
                 "review_engineering",
@@ -695,8 +694,7 @@ class TestExperimentReviewForm(
                 "review_bugzilla",
                 "review_qa",
                 "review_relman",
-                ]
-            ),
+            },
         )
 
     def test_required_reviews_when_a_risk_partner_related_is_true(self):
@@ -753,16 +751,14 @@ class TestExperimentReviewForm(
         form = ExperimentReviewForm(self.request, instance=experiment)
 
         self.assertEqual(
-            set([f.name for f in form.required_reviews]),
-            set(
-                [
+            {f.name for f in form.required_reviews},
+            {
                 "review_qa",
                 "review_intent_to_ship",
                 "review_qa_requested",
                 "review_advisory",
                 "review_relman",
-                ]
-            ),
+            },
         )
 
     def test_optional_reviews_for_rollout(self):
@@ -771,9 +767,8 @@ class TestExperimentReviewForm(
         form = ExperimentReviewForm(self.request, instance=experiment)
 
         self.assertEqual(
-            set([f.name for f in form.optional_reviews]),
-            set(
-                [
+            {f.name for f in form.optional_reviews},
+            {
                 "review_impacted_teams",
                 "review_ux",
                 "review_legal",
@@ -781,8 +776,7 @@ class TestExperimentReviewForm(
                 "review_vp",
                 "review_comms",
                 "review_data_steward",
-                ]
-            ),
+            },
         )
 
     def test_cannot_check_review_relman_without_permissions(self):

app/experimenter/legacy/legacy_experiments/tests/test_models.py

@@ -741,35 +741,35 @@ class TestExperimentModel(TestCase):
 
         self.assertEqual(
             set(experiment.grouped_changes.keys()),
-            set([date1.date(), date2.date(), date3.date()]),
+            {date1.date(), date2.date(), date3.date()},
         )
         self.assertEqual(
-            set(experiment.grouped_changes[date1.date()].keys()), set([user1, user2])
+            set(experiment.grouped_changes[date1.date()].keys()), {user1, user2}
         )
         self.assertEqual(
-            set(experiment.grouped_changes[date2.date()].keys()), set([user2, user3])
+            set(experiment.grouped_changes[date2.date()].keys()), {user2, user3}
         )
         self.assertEqual(
             set(experiment.grouped_changes[date3.date()].keys()),
-            set([user1, user2, user3]),
+            {user1, user2, user3},
         )
 
         self.assertEqual(
             experiment.grouped_changes[date1.date()][user1],
-            set([change1, change2, change3]),
+            {change1, change2, change3},
         )
-        self.assertEqual(experiment.grouped_changes[date1.date()][user2], set([change4]))
+        self.assertEqual(experiment.grouped_changes[date1.date()][user2], {change4})
 
-        self.assertEqual(experiment.grouped_changes[date2.date()][user2], set([change5]))
+        self.assertEqual(experiment.grouped_changes[date2.date()][user2], {change5})
         self.assertEqual(
-            experiment.grouped_changes[date2.date()][user3], set([change6, change7])
+            experiment.grouped_changes[date2.date()][user3], {change6, change7}
         )
 
         self.assertEqual(
-            experiment.grouped_changes[date3.date()][user1], set([change8, change9])
+            experiment.grouped_changes[date3.date()][user1], {change8, change9}
         )
-        self.assertEqual(experiment.grouped_changes[date3.date()][user2], set([change10]))
-        self.assertEqual(experiment.grouped_changes[date3.date()][user3], set([change11]))
+        self.assertEqual(experiment.grouped_changes[date3.date()][user2], {change10})
+        self.assertEqual(experiment.grouped_changes[date3.date()][user3], {change11})
 
     def test_ordered_changes_orders_by_date(self):
         experiment = ExperimentFactory.create()
@@ -817,22 +817,22 @@ class TestExperimentModel(TestCase):
         )
 
         expected_changes = {
-            date1.date(): {user1: set([a, b]), user2: set([c])},
-            date2.date(): {user2: set([d]), user3: set([e, f])},
-            date3.date(): {user1: set([g, h]), user2: set([i]), user3: set([j])},
+            date1.date(): {user1: {a, b}, user2: {c}},
+            date2.date(): {user2: {d}, user3: {e, f}},
+            date3.date(): {user1: {g, h}, user2: {i}, user3: {j}},
         }
 
         ordered_dates = [date for date, changes in experiment.ordered_changes]
         self.assertEqual(ordered_dates, [date3.date(), date2.date(), date1.date()])
 
         day3_users = [user for user, user_changes in experiment.ordered_changes[0][1]]
-        self.assertEqual(set(day3_users), set([user1, user2, user3]))
+        self.assertEqual(set(day3_users), {user1, user2, user3})
 
         day2_users = [user for user, user_changes in experiment.ordered_changes[1][1]]
-        self.assertEqual(set(day2_users), set([user2, user3]))
+        self.assertEqual(set(day2_users), {user2, user3})
 
         day1_users = [user for user, user_changes in experiment.ordered_changes[2][1]]
-        self.assertEqual(set(day1_users), set([user1, user2]))
+        self.assertEqual(set(day1_users), {user1, user2})
 
         for date, date_changes in experiment.ordered_changes:
             for user, user_changes in date_changes:

app/experimenter/legacy/legacy_experiments/tests/test_views.py

@@ -32,7 +32,7 @@ class TestExperimentListView(TestCase):
         # Archived experiment is ommitted
         ExperimentFactory.create_with_status(Experiment.STATUS_DRAFT, archived=True)
 
-        for i in range(3):
+        for _ in range(3):
             ExperimentFactory.create_with_status(
                 random.choice(Experiment.STATUS_CHOICES)[0]
             )
@@ -57,7 +57,7 @@ class TestExperimentListView(TestCase):
         # Archived experiment is included
         ExperimentFactory.create_with_status(Experiment.STATUS_DRAFT, archived=True)
 
-        for i in range(3):
+        for _ in range(3):
             ExperimentFactory.create_with_status(
                 random.choice(Experiment.STATUS_CHOICES)[0]
             )
@@ -85,7 +85,7 @@ class TestExperimentListView(TestCase):
         filtered_types = (Experiment.TYPE_PREF, Experiment.TYPE_GENERIC)
         filtered_version = Experiment.VERSION_CHOICES[1][0]
 
-        for i in range(3):
+        for _ in range(3):
             for filtered_type in filtered_types:
                 ExperimentFactory.create_with_status(
                     firefox_channel=filtered_channel,
@@ -95,7 +95,7 @@ class TestExperimentListView(TestCase):
                     type=filtered_type,
                 )
 
-        for i in range(3):
+        for _ in range(3):
             ExperimentFactory.create_with_status(
                 random.choice(Experiment.STATUS_CHOICES)[0]
             )
@@ -134,7 +134,7 @@ class TestExperimentListView(TestCase):
         user_email = "user@example.com"
 
         number_of_experiments = settings.EXPERIMENTS_PAGINATE_BY + 1
-        for i in range(number_of_experiments):
+        for _ in range(number_of_experiments):
             ExperimentFactory.create_with_status(
                 random.choice(Experiment.STATUS_CHOICES)[0]
             )

app/experimenter/legacy/normandy/client.py

@@ -21,22 +21,22 @@ class NormandyDecodeError(NormandyError):
     message = "Error parsing JSON Normandy Response"
 
 
-def make_normandy_call(url, params={}):
+def make_normandy_call(url, params=None):
+    if params is None:
+        params = {}
     try:
         response = requests.get(url, verify=(not settings.DEBUG), params=params)
         response.raise_for_status()
         return response.json()
     except requests.exceptions.HTTPError as e:
-        logging.exception(
-            "Normandy API returned Nonsuccessful Response Code: {}".format(e)
-        )
-        raise NonsuccessfulNormandyCall(*e.args)
+        logging.exception(f"Normandy API returned Nonsuccessful Response Code: {e}")
+        raise NonsuccessfulNormandyCall(*e.args) from e
     except requests.exceptions.RequestException as e:
-        logging.exception("Error calling Normandy API: {}".format(e))
-        raise APINormandyError(*e.args)
+        logging.exception(f"Error calling Normandy API: {e}")
+        raise APINormandyError(*e.args) from e
     except ValueError as e:
-        logging.exception("Error parsing JSON Normandy response: {}".format(e))
-        raise NormandyDecodeError(*e.args)
+        logging.exception(f"Error parsing JSON Normandy response: {e}")
+        raise NormandyDecodeError(*e.args) from e
 
 
 def get_recipe(recipe_id):
@@ -59,8 +59,7 @@ def get_recipe_state_enabler(recipe_data):
 
     enabled_states = recipe_data.get("enabled_states", [])
     if len(enabled_states) > 0:
-        creator = enabled_states[0].get("creator")
-        if creator:
+        if creator := enabled_states[0].get("creator"):
             enabler_email = creator.get("email")
 
     enabler, _ = get_user_model().objects.get_or_create(

app/experimenter/legacy/normandy/tasks.py

@@ -44,7 +44,7 @@ def update_recipe_ids_to_experiments():
 
     for experiment in ready_to_ship_experiments:
         try:
-            logger.info("Updating Experiment: {}".format(experiment))
+            logger.info(f"Updating Experiment: {experiment}")
             recipe_data = normandy.get_recipe_list(experiment.slug)
 
             if len(recipe_data):
@@ -82,7 +82,7 @@ def update_launched_experiments():
 
     for experiment in launched_experiments:
         try:
-            logger.info("Updating Experiment: {}".format(experiment))
+            logger.info(f"Updating Experiment: {experiment}")
             if experiment.normandy_id:
                 recipe_data = normandy.get_recipe(experiment.normandy_id)
 
@@ -103,9 +103,7 @@ def update_launched_experiments():
                     send_period_ending_emails_task(experiment)
 
             else:
-                logger.info(
-                    "Skipping Experiment: {}. No Normandy id found".format(experiment)
-                )
+                logger.info(f"Skipping Experiment: {experiment}. No Normandy id found")
         except (IntegrityError, KeyError, normandy.NormandyError) as e:
             logger.info(f"Failed to update Experiment {experiment}: {e}")
             metrics.incr("update_launched_experiments.failed")
@@ -214,12 +212,12 @@ def update_population_percent(experiment, recipe_data, filter_objects):
 
 
 def update_firefox_versions(experiment, recipe_data, filter_objects):
-    changed_data = {}
-
     if versions := filter_objects.get("version"):
 
         min_version = str(float(min(versions["versions"])))
         max_version = str(float(max(versions["versions"])))
+        changed_data = {}
+
         if experiment.firefox_min_version != min_version:
             changed_data["firefox_min_version"] = min_version
         if experiment.firefox_max_version != max_version:

app/experimenter/legacy/normandy/tests/test_serializers.py

@@ -139,7 +139,7 @@ class TestFilterObjectLocaleSerializer(TestCase):
         experiment = ExperimentFactory.create(locales=[locale1, locale2])
         serializer = FilterObjectLocaleSerializer(experiment)
         self.assertEqual(serializer.data["type"], "locale")
-        self.assertEqual(set(serializer.data["locales"]), set(["ab", "cd"]))
+        self.assertEqual(set(serializer.data["locales"]), {"ab", "cd"})
 
 
 class TestFilterObjectCountrySerializer(TestCase):
@@ -149,7 +149,7 @@ class TestFilterObjectCountrySerializer(TestCase):
         experiment = ExperimentFactory.create(countries=[country1, country2])
         serializer = FilterObjectCountrySerializer(experiment)
         self.assertEqual(serializer.data["type"], "country")
-        self.assertEqual(set(serializer.data["countries"]), set(["ab", "cd"]))
+        self.assertEqual(set(serializer.data["countries"]), {"ab", "cd"})
 
 
 class TestExperimentRecipeAddonVariantSerializer(TestCase):

app/experimenter/legacy/notifications/tests/test_models.py

@@ -8,7 +8,7 @@ class TestNotificationModel(TestCase):
     def test_has_unread_false_when_all_read(self):
         user = UserFactory.create()
 
-        for i in range(3):
+        for _ in range(3):
             NotificationFactory.create(user=user, read=True)
 
         self.assertFalse(user.notifications.has_unread)
@@ -23,14 +23,12 @@ class TestNotificationModel(TestCase):
     def test_get_unread_returns_unread_and_marks_as_read(self):
         user = UserFactory.create()
 
-        unread_notifications = []
-        for i in range(3):
-            unread_notifications.append(NotificationFactory.create(user=user, read=False))
-
-        read_notifications = []
-        for i in range(3):
-            read_notifications.append(NotificationFactory.create(user=user, read=True))
-
+        unread_notifications = [
+            NotificationFactory.create(user=user, read=False) for _ in range(3)
+        ]
+        read_notifications = [
+            NotificationFactory.create(user=user, read=True) for _ in range(3)
+        ]
         self.assertTrue(user.notifications.has_unread)
 
         notifications = user.notifications.get_unread()
@@ -45,7 +43,7 @@ class TestNotificationModel(TestCase):
 
         user1_notifications = []
         user2_notifications = []
-        for i in range(3):
+        for _ in range(3):
             user1_notifications.append(NotificationFactory.create(user=user1))
             user2_notifications.append(NotificationFactory.create(user=user2))
 

app/experimenter/openidc/middleware.py

@@ -54,9 +54,7 @@ class OpenIDCAuthMiddleware(AuthenticationMiddleware):
 
 class OpenIDCRestFrameworkAuthenticator(SessionAuthentication):
     def authenticate(self, request):
-        authenticated_user = getattr(request._request, "user", None)
-
-        if authenticated_user:
+        if authenticated_user := getattr(request._request, "user", None):
             return (authenticated_user, None)
 
         return super().authenticate(request)

app/experimenter/projects/tests/factories.py

@@ -9,7 +9,7 @@ faker = FakerFactory.create()
 
 class ProjectFactory(factory.django.DjangoModelFactory):
     name = factory.LazyAttribute(lambda o: faker.catch_phrase())
-    slug = factory.LazyAttribute(lambda o: "{}_".format(slugify(o.name)))
+    slug = factory.LazyAttribute(lambda o: f"{slugify(o.name)}_")
 
     class Meta:
         model = Project

app/experimenter/targeting/tests/test_targeting_configs.py

@@ -9,8 +9,8 @@ from experimenter.targeting.constants import TargetingConstants
 class TestTargetingConfigs(TestCase):
     def test_all_targeting_configs_defined_in_constants(self):
         self.assertEqual(
-            set([t.value for t in TargetingConstants.TargetingConfig]),
-            set(t for t in TargetingConstants.TARGETING_CONFIGS.keys()),
+            {t.value for t in TargetingConstants.TargetingConfig},
+            set(TargetingConstants.TARGETING_CONFIGS.keys()),
             "Targeting Configs must be defined in both "
             "TargetingConstants.TargetingConfig and TargetingConstants.TARGETING_CONFIGS",
         )
@@ -21,4 +21,6 @@ class TestTargetingConfigs(TestCase):
             try:
                 JEXLParser().parse(targeting_config.targeting)
             except ParseError as e:
-                raise Exception(f"JEXL Parse error in {targeting_config.name}: {e}")
+                raise Exception(
+                    f"JEXL Parse error in {targeting_config.name}: {e}"
+                ) from e