[Python] Remove unnecessary if else. (#2985)

* Remove Unnecessary `if else`

* update samples

modules/openapi-generator/src/main/resources/python/api.mustache

@@ -55,11 +55,7 @@ class {{classname}}(object):
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.{{operationId}}_with_http_info({{#sortParamsByRequiredFlag}}{{#allParams}}{{#required}}{{paramName}}, {{/required}}{{/allParams}}{{/sortParamsByRequiredFlag}}**kwargs)  # noqa: E501
-        else:
-            (data) = self.{{operationId}}_with_http_info({{#sortParamsByRequiredFlag}}{{#allParams}}{{#required}}{{paramName}}, {{/required}}{{/allParams}}{{/sortParamsByRequiredFlag}}**kwargs)  # noqa: E501
-            return data
+        return self.{{operationId}}_with_http_info({{#sortParamsByRequiredFlag}}{{#allParams}}{{#required}}{{paramName}}, {{/required}}{{/allParams}}{{/sortParamsByRequiredFlag}}**kwargs)  # noqa: E501
 
     def {{operationId}}_with_http_info(self, {{#sortParamsByRequiredFlag}}{{#allParams}}{{#required}}{{paramName}}, {{/required}}{{/allParams}}{{/sortParamsByRequiredFlag}}**kwargs):  # noqa: E501
         """{{#summary}}{{{.}}}{{/summary}}{{^summary}}{{operationId}}{{/summary}}  # noqa: E501

samples/client/petstore/python-asyncio/petstore_api/api/another_fake_api.py

@@ -52,11 +52,7 @@ def call_123_test_special_tags(self, body, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.call_123_test_special_tags_with_http_info(body, **kwargs)  # noqa: E501
-        else:
-            (data) = self.call_123_test_special_tags_with_http_info(body, **kwargs)  # noqa: E501
-            return data
+        return self.call_123_test_special_tags_with_http_info(body, **kwargs)  # noqa: E501
 
     def call_123_test_special_tags_with_http_info(self, body, **kwargs):  # noqa: E501
         """To test special tags  # noqa: E501

samples/client/petstore/python-asyncio/petstore_api/api/fake_api.py

@@ -52,11 +52,7 @@ def create_xml_item(self, xml_item, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.create_xml_item_with_http_info(xml_item, **kwargs)  # noqa: E501
-        else:
-            (data) = self.create_xml_item_with_http_info(xml_item, **kwargs)  # noqa: E501
-            return data
+        return self.create_xml_item_with_http_info(xml_item, **kwargs)  # noqa: E501
 
     def create_xml_item_with_http_info(self, xml_item, **kwargs):  # noqa: E501
         """creates an XmlItem  # noqa: E501
@@ -148,11 +144,7 @@ def fake_outer_boolean_serialize(self, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.fake_outer_boolean_serialize_with_http_info(**kwargs)  # noqa: E501
-        else:
-            (data) = self.fake_outer_boolean_serialize_with_http_info(**kwargs)  # noqa: E501
-            return data
+        return self.fake_outer_boolean_serialize_with_http_info(**kwargs)  # noqa: E501
 
     def fake_outer_boolean_serialize_with_http_info(self, **kwargs):  # noqa: E501
         """fake_outer_boolean_serialize  # noqa: E501
@@ -240,11 +232,7 @@ def fake_outer_composite_serialize(self, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.fake_outer_composite_serialize_with_http_info(**kwargs)  # noqa: E501
-        else:
-            (data) = self.fake_outer_composite_serialize_with_http_info(**kwargs)  # noqa: E501
-            return data
+        return self.fake_outer_composite_serialize_with_http_info(**kwargs)  # noqa: E501
 
     def fake_outer_composite_serialize_with_http_info(self, **kwargs):  # noqa: E501
         """fake_outer_composite_serialize  # noqa: E501
@@ -332,11 +320,7 @@ def fake_outer_number_serialize(self, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.fake_outer_number_serialize_with_http_info(**kwargs)  # noqa: E501
-        else:
-            (data) = self.fake_outer_number_serialize_with_http_info(**kwargs)  # noqa: E501
-            return data
+        return self.fake_outer_number_serialize_with_http_info(**kwargs)  # noqa: E501
 
     def fake_outer_number_serialize_with_http_info(self, **kwargs):  # noqa: E501
         """fake_outer_number_serialize  # noqa: E501
@@ -424,11 +408,7 @@ def fake_outer_string_serialize(self, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.fake_outer_string_serialize_with_http_info(**kwargs)  # noqa: E501
-        else:
-            (data) = self.fake_outer_string_serialize_with_http_info(**kwargs)  # noqa: E501
-            return data
+        return self.fake_outer_string_serialize_with_http_info(**kwargs)  # noqa: E501
 
     def fake_outer_string_serialize_with_http_info(self, **kwargs):  # noqa: E501
         """fake_outer_string_serialize  # noqa: E501
@@ -516,11 +496,7 @@ def test_body_with_file_schema(self, body, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.test_body_with_file_schema_with_http_info(body, **kwargs)  # noqa: E501
-        else:
-            (data) = self.test_body_with_file_schema_with_http_info(body, **kwargs)  # noqa: E501
-            return data
+        return self.test_body_with_file_schema_with_http_info(body, **kwargs)  # noqa: E501
 
     def test_body_with_file_schema_with_http_info(self, body, **kwargs):  # noqa: E501
         """test_body_with_file_schema  # noqa: E501
@@ -612,11 +588,7 @@ def test_body_with_query_params(self, query, body, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.test_body_with_query_params_with_http_info(query, body, **kwargs)  # noqa: E501
-        else:
-            (data) = self.test_body_with_query_params_with_http_info(query, body, **kwargs)  # noqa: E501
-            return data
+        return self.test_body_with_query_params_with_http_info(query, body, **kwargs)  # noqa: E501
 
     def test_body_with_query_params_with_http_info(self, query, body, **kwargs):  # noqa: E501
         """test_body_with_query_params  # noqa: E501
@@ -714,11 +686,7 @@ def test_client_model(self, body, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.test_client_model_with_http_info(body, **kwargs)  # noqa: E501
-        else:
-            (data) = self.test_client_model_with_http_info(body, **kwargs)  # noqa: E501
-            return data
+        return self.test_client_model_with_http_info(body, **kwargs)  # noqa: E501
 
     def test_client_model_with_http_info(self, body, **kwargs):  # noqa: E501
         """To test \"client\" model  # noqa: E501
@@ -827,11 +795,7 @@ def test_endpoint_parameters(self, number, double, pattern_without_delimiter, by
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.test_endpoint_parameters_with_http_info(number, double, pattern_without_delimiter, byte, **kwargs)  # noqa: E501
-        else:
-            (data) = self.test_endpoint_parameters_with_http_info(number, double, pattern_without_delimiter, byte, **kwargs)  # noqa: E501
-            return data
+        return self.test_endpoint_parameters_with_http_info(number, double, pattern_without_delimiter, byte, **kwargs)  # noqa: E501
 
     def test_endpoint_parameters_with_http_info(self, number, double, pattern_without_delimiter, byte, **kwargs):  # noqa: E501
         """Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트   # noqa: E501
@@ -1009,11 +973,7 @@ def test_enum_parameters(self, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.test_enum_parameters_with_http_info(**kwargs)  # noqa: E501
-        else:
-            (data) = self.test_enum_parameters_with_http_info(**kwargs)  # noqa: E501
-            return data
+        return self.test_enum_parameters_with_http_info(**kwargs)  # noqa: E501
 
     def test_enum_parameters_with_http_info(self, **kwargs):  # noqa: E501
         """To test enum parameters  # noqa: E501
@@ -1130,11 +1090,7 @@ def test_group_parameters(self, required_string_group, required_boolean_group, r
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.test_group_parameters_with_http_info(required_string_group, required_boolean_group, required_int64_group, **kwargs)  # noqa: E501
-        else:
-            (data) = self.test_group_parameters_with_http_info(required_string_group, required_boolean_group, required_int64_group, **kwargs)  # noqa: E501
-            return data
+        return self.test_group_parameters_with_http_info(required_string_group, required_boolean_group, required_int64_group, **kwargs)  # noqa: E501
 
     def test_group_parameters_with_http_info(self, required_string_group, required_boolean_group, required_int64_group, **kwargs):  # noqa: E501
         """Fake endpoint to test group parameters (optional)  # noqa: E501
@@ -1244,11 +1200,7 @@ def test_inline_additional_properties(self, param, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.test_inline_additional_properties_with_http_info(param, **kwargs)  # noqa: E501
-        else:
-            (data) = self.test_inline_additional_properties_with_http_info(param, **kwargs)  # noqa: E501
-            return data
+        return self.test_inline_additional_properties_with_http_info(param, **kwargs)  # noqa: E501
 
     def test_inline_additional_properties_with_http_info(self, param, **kwargs):  # noqa: E501
         """test inline additionalProperties  # noqa: E501
@@ -1339,11 +1291,7 @@ def test_json_form_data(self, param, param2, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.test_json_form_data_with_http_info(param, param2, **kwargs)  # noqa: E501
-        else:
-            (data) = self.test_json_form_data_with_http_info(param, param2, **kwargs)  # noqa: E501
-            return data
+        return self.test_json_form_data_with_http_info(param, param2, **kwargs)  # noqa: E501
 
     def test_json_form_data_with_http_info(self, param, param2, **kwargs):  # noqa: E501
         """test json serialization of form data  # noqa: E501

samples/client/petstore/python-asyncio/petstore_api/api/fake_classname_tags_123_api.py

@@ -52,11 +52,7 @@ def test_classname(self, body, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.test_classname_with_http_info(body, **kwargs)  # noqa: E501
-        else:
-            (data) = self.test_classname_with_http_info(body, **kwargs)  # noqa: E501
-            return data
+        return self.test_classname_with_http_info(body, **kwargs)  # noqa: E501
 
     def test_classname_with_http_info(self, body, **kwargs):  # noqa: E501
         """To test class name in snake case  # noqa: E501

samples/client/petstore/python-asyncio/petstore_api/api/pet_api.py

@@ -51,11 +51,7 @@ def add_pet(self, body, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.add_pet_with_http_info(body, **kwargs)  # noqa: E501
-        else:
-            (data) = self.add_pet_with_http_info(body, **kwargs)  # noqa: E501
-            return data
+        return self.add_pet_with_http_info(body, **kwargs)  # noqa: E501
 
     def add_pet_with_http_info(self, body, **kwargs):  # noqa: E501
         """Add a new pet to the store  # noqa: E501
@@ -146,11 +142,7 @@ def delete_pet(self, pet_id, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.delete_pet_with_http_info(pet_id, **kwargs)  # noqa: E501
-        else:
-            (data) = self.delete_pet_with_http_info(pet_id, **kwargs)  # noqa: E501
-            return data
+        return self.delete_pet_with_http_info(pet_id, **kwargs)  # noqa: E501
 
     def delete_pet_with_http_info(self, pet_id, **kwargs):  # noqa: E501
         """Deletes a pet  # noqa: E501
@@ -240,11 +232,7 @@ def find_pets_by_status(self, status, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.find_pets_by_status_with_http_info(status, **kwargs)  # noqa: E501
-        else:
-            (data) = self.find_pets_by_status_with_http_info(status, **kwargs)  # noqa: E501
-            return data
+        return self.find_pets_by_status_with_http_info(status, **kwargs)  # noqa: E501
 
     def find_pets_by_status_with_http_info(self, status, **kwargs):  # noqa: E501
         """Finds Pets by status  # noqa: E501
@@ -337,11 +325,7 @@ def find_pets_by_tags(self, tags, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.find_pets_by_tags_with_http_info(tags, **kwargs)  # noqa: E501
-        else:
-            (data) = self.find_pets_by_tags_with_http_info(tags, **kwargs)  # noqa: E501
-            return data
+        return self.find_pets_by_tags_with_http_info(tags, **kwargs)  # noqa: E501
 
     def find_pets_by_tags_with_http_info(self, tags, **kwargs):  # noqa: E501
         """Finds Pets by tags  # noqa: E501
@@ -434,11 +418,7 @@ def get_pet_by_id(self, pet_id, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.get_pet_by_id_with_http_info(pet_id, **kwargs)  # noqa: E501
-        else:
-            (data) = self.get_pet_by_id_with_http_info(pet_id, **kwargs)  # noqa: E501
-            return data
+        return self.get_pet_by_id_with_http_info(pet_id, **kwargs)  # noqa: E501
 
     def get_pet_by_id_with_http_info(self, pet_id, **kwargs):  # noqa: E501
         """Find pet by ID  # noqa: E501
@@ -529,11 +509,7 @@ def update_pet(self, body, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.update_pet_with_http_info(body, **kwargs)  # noqa: E501
-        else:
-            (data) = self.update_pet_with_http_info(body, **kwargs)  # noqa: E501
-            return data
+        return self.update_pet_with_http_info(body, **kwargs)  # noqa: E501
 
     def update_pet_with_http_info(self, body, **kwargs):  # noqa: E501
         """Update an existing pet  # noqa: E501
@@ -625,11 +601,7 @@ def update_pet_with_form(self, pet_id, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.update_pet_with_form_with_http_info(pet_id, **kwargs)  # noqa: E501
-        else:
-            (data) = self.update_pet_with_form_with_http_info(pet_id, **kwargs)  # noqa: E501
-            return data
+        return self.update_pet_with_form_with_http_info(pet_id, **kwargs)  # noqa: E501
 
     def update_pet_with_form_with_http_info(self, pet_id, **kwargs):  # noqa: E501
         """Updates a pet in the store with form data  # noqa: E501
@@ -727,11 +699,7 @@ def upload_file(self, pet_id, **kwargs):  # noqa: E501
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.upload_file_with_http_info(pet_id, **kwargs)  # noqa: E501
-        else:
-            (data) = self.upload_file_with_http_info(pet_id, **kwargs)  # noqa: E501
-            return data
+        return self.upload_file_with_http_info(pet_id, **kwargs)  # noqa: E501
 
     def upload_file_with_http_info(self, pet_id, **kwargs):  # noqa: E501
         """uploads an image  # noqa: E501
@@ -833,11 +801,7 @@ def upload_file_with_required_file(self, pet_id, required_file, **kwargs):  # no
                  returns the request thread.
         """
         kwargs['_return_http_data_only'] = True
-        if kwargs.get('async_req'):
-            return self.upload_file_with_required_file_with_http_info(pet_id, required_file, **kwargs)  # noqa: E501
-        else:
-            (data) = self.upload_file_with_required_file_with_http_info(pet_id, required_file, **kwargs)  # noqa: E501
-            return data
+        return self.upload_file_with_required_file_with_http_info(pet_id, required_file, **kwargs)  # noqa: E501
 
     def upload_file_with_required_file_with_http_info(self, pet_id, required_file, **kwargs):  # noqa: E501
         """uploads an image (required)  # noqa: E501