Fix generation of map model examples (#8063)

When generation examples of objects with additional properties, we use
the map syntax inside a model instantiation, which is incorrect. This
fixes it by checking for model at the right place.

Author: therve

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonClientCodegen.java

@@ -1072,7 +1072,10 @@ private String toExampleValueRecursive(String modelName, Schema schema, Object o
                     key = addPropsSchema.getEnum().get(0).toString();
                 }
                 addPropsExample = exampleFromStringOrArraySchema(addPropsSchema, addPropsExample, key);
-                String addPropPrefix = ensureQuotes(key) + ": ";
+                String addPropPrefix = key + "=";
+                if (modelName == null) {
+                        addPropPrefix = ensureQuotes(key) + ": ";
+                }
                 String addPropsModelName = getModelName(addPropsSchema);
                 example = fullPrefix + "\n" +  toExampleValueRecursive(addPropsModelName, addPropsSchema, addPropsExample, indentationLevel + 1, addPropPrefix, exampleLine + 1) + ",\n" + closingIndentation + closeChars;
             } else {

samples/openapi3/client/petstore/python/docs/FakeApi.md

@@ -51,7 +51,7 @@ with petstore_api.ApiClient() as api_client:
     # Create an instance of the API class
     api_instance = fake_api.FakeApi(api_client)
     additional_properties_with_array_of_enums = AdditionalPropertiesWithArrayOfEnums(
-        "key": [
+        key=[
             EnumClass("-efg"),
         ],
     ) # AdditionalPropertiesWithArrayOfEnums | Input enum (optional)