[BUG] Python: Bad return for json like str response

[dyens]

Hi!

I faced up with a problem in kubernetes python client kubernetes-client/python#2196.
This client use openapi-generator. For str responses that looks like a good json we have a bad transformation:

{"a": "a"} \\ valid json string
comes to
{'a': 'a'} \\ not valid

The reason for this in this line:

openapi-generator/modules/openapi-generator/src/main/resources/python-pydantic-v1/api_client.mustache

Line 340 in 1fbf722

data = json.loads(response.data)

There we have

response_type == 'str' 
response.data == '{"a": "a"}'

This is a valid json, so after L340:

data == {'a': 'a'}  # this is a dict object in python (no more string)

Then self.__deserialize_primitive transforms this dict to string:

return klass(data) # where klass == str, data =  {'a': 'a'} 

In python str(dict(a="a")) == {'a': 'a'}

So, after this transformations double quotes replaced by ordinary quotes.