adding not_contains

pykusto/expressions.py

@@ -253,6 +253,9 @@ class StringExpression(BaseExpression):
     def contains(self, other: StringType, case_sensitive: bool = False) -> BooleanExpression:
         return BooleanExpression.binary_op(self, ' contains_cs ' if case_sensitive else ' contains ', other)
 
+    def not_contains(self, other: StringType, case_sensitive: bool = False) -> BooleanExpression:
+        return BooleanExpression.binary_op(self, ' !contains_cs ' if case_sensitive else ' !contains ', other)
+
     def startswith(self, other: StringType, case_sensitive: bool = False) -> BooleanExpression:
         return BooleanExpression.binary_op(self, ' startswith_cs ' if case_sensitive else ' startswith ', other)
 

test/test_expressions.py

@@ -11,6 +11,20 @@ class TestExpressions(TestBase):
             ' | where foo contains "bar"',
             Query().where(col.foo.contains('bar')).render(),
         )
+        self.assertEqual(
+            ' | where foo contains_cs "bar"',
+            Query().where(col.foo.contains('bar', True)).render(),
+        )
+
+    def test_not_contains(self):
+        self.assertEqual(
+            ' | where foo !contains "bar"',
+            Query().where(col.foo.not_contains('bar')).render(),
+        )
+        self.assertEqual(
+            ' | where foo !contains_cs "bar"',
+            Query().where(col.foo.not_contains('bar', True)).render(),
+        )
 
     def test_array_access(self):
         self.assertEqual(