[python][Feat] Deserialize error responses (#17038)

* refactor: Clean up _response_types_map formatting

It matches black's behavior of having trailing commas now.

* test: Add test to reproduce #16967

* fix: deserialize responses even if no returnType

Closes #16967

* refactor: Simplify ApiException subclasses

* refactor: Move exception subtype choice to ApiException

* feat: Deserialize error responses and add to exceptions

* test: Add for error responses with model

samples/openapi3/client/petstore/python/test/test_test_error_responses_with_model400_response.py

@@ -0,0 +1,52 @@
+# coding: utf-8
+
+"""
+    OpenAPI Petstore
+
+    This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+
+    The version of the OpenAPI document: 1.0.0
+    Generated by OpenAPI Generator (https://openapi-generator.tech)
+
+    Do not edit the class manually.
+"""  # noqa: E501
+
+
+import unittest
+import datetime
+
+from petstore_api.models.test_error_responses_with_model400_response import TestErrorResponsesWithModel400Response
+
+class TestTestErrorResponsesWithModel400Response(unittest.TestCase):
+    """TestErrorResponsesWithModel400Response unit test stubs"""
+
+    def setUp(self):
+        pass
+
+    def tearDown(self):
+        pass
+
+    def make_instance(self, include_optional) -> TestErrorResponsesWithModel400Response:
+        """Test TestErrorResponsesWithModel400Response
+            include_option is a boolean, when False only required
+            params are included, when True both required and
+            optional params are included """
+        # uncomment below to create an instance of `TestErrorResponsesWithModel400Response`
+        """
+        model = TestErrorResponsesWithModel400Response()
+        if include_optional:
+            return TestErrorResponsesWithModel400Response(
+                reason400 = ''
+            )
+        else:
+            return TestErrorResponsesWithModel400Response(
+        )
+        """
+
+    def testTestErrorResponsesWithModel400Response(self):
+        """Test TestErrorResponsesWithModel400Response"""
+        # inst_req_only = self.make_instance(include_optional=False)
+        # inst_req_and_optional = self.make_instance(include_optional=True)
+
+if __name__ == '__main__':
+    unittest.main()

samples/openapi3/client/petstore/python/test/test_test_error_responses_with_model404_response.py

@@ -0,0 +1,52 @@
+# coding: utf-8
+
+"""
+    OpenAPI Petstore
+
+    This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+
+    The version of the OpenAPI document: 1.0.0
+    Generated by OpenAPI Generator (https://openapi-generator.tech)
+
+    Do not edit the class manually.
+"""  # noqa: E501
+
+
+import unittest
+import datetime
+
+from petstore_api.models.test_error_responses_with_model404_response import TestErrorResponsesWithModel404Response
+
+class TestTestErrorResponsesWithModel404Response(unittest.TestCase):
+    """TestErrorResponsesWithModel404Response unit test stubs"""
+
+    def setUp(self):
+        pass
+
+    def tearDown(self):
+        pass
+
+    def make_instance(self, include_optional) -> TestErrorResponsesWithModel404Response:
+        """Test TestErrorResponsesWithModel404Response
+            include_option is a boolean, when False only required
+            params are included, when True both required and
+            optional params are included """
+        # uncomment below to create an instance of `TestErrorResponsesWithModel404Response`
+        """
+        model = TestErrorResponsesWithModel404Response()
+        if include_optional:
+            return TestErrorResponsesWithModel404Response(
+                reason404 = ''
+            )
+        else:
+            return TestErrorResponsesWithModel404Response(
+        )
+        """
+
+    def testTestErrorResponsesWithModel404Response(self):
+        """Test TestErrorResponsesWithModel404Response"""
+        # inst_req_only = self.make_instance(include_optional=False)
+        # inst_req_and_optional = self.make_instance(include_optional=True)
+
+if __name__ == '__main__':
+    unittest.main()