[http-client-python] Fix deserialization subtype (#4716)

Related SDK diff:
https://github.com/Azure/autorest.python/pull/2430/files

packages/http-client-python/CHANGELOG.md

@@ -1,5 +1,11 @@
 # Change Log - @typespec/http-client-python
 
+## 0.3.1
+
+### Bug Fixes
+
+- Avoid change original data when deserialize for polymorphic model
+
 ## 0.3.0
 
 ### Bump dependencies

packages/http-client-python/generator/pygen/codegen/templates/serialization.py.jinja2

@@ -506,7 +506,6 @@ class Model(object):
     def _classify(cls, response, objects):
         """Check the class _subtype_map for any child classes.
         We want to ignore any inherited _subtype_maps.
-        Remove the polymorphic key from the initial data.
 
         :param dict response: The initial data
         :param dict objects: The class objects
@@ -518,7 +517,7 @@ class Model(object):
 
             if not isinstance(response, ET.Element):
                 rest_api_response_key = cls._get_rest_key_parts(subtype_key)[-1]
-                subtype_value = response.pop(rest_api_response_key, None) or response.pop(subtype_key, None)
+                subtype_value = response.get(rest_api_response_key, None) or response.get(subtype_key, None)
             else:
                 subtype_value = xml_key_extractor(subtype_key, cls._attribute_map[subtype_key], response)
             if subtype_value:

packages/http-client-python/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@typespec/http-client-python",
-  "version": "0.3.0",
+  "version": "0.3.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@typespec/http-client-python",
-      "version": "0.3.0",
+      "version": "0.3.1",
       "hasInstallScript": true,
       "license": "MIT",
       "dependencies": {

packages/http-client-python/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@typespec/http-client-python",
-  "version": "0.3.0",
+  "version": "0.3.1",
   "author": "Microsoft Corporation",
   "description": "TypeSpec emitter for Python SDKs",
   "homepage": "https://typespec.io",