[python-flask] adopt python3.5+ syntax (#16375)

* adopt python3.5+ syntax

removing some residual python2 code, since it is not supported anymore, like:
- no need for `six` anymore
- no need for encoding utf8 in top file
- remove `object` inheritance in base model
- remove absolute import `__future__`

* generate samples

applying the new templates

* update python ignore pattern

ignore all the `.venv` folders

Author: anis-campos

.gitignore

@@ -173,14 +173,13 @@ samples/client/petstore/csharp-refactor/OpenAPIClient/nuget.exe
 # Python
 *.pyc
 __pycache__
+.venv/
 samples/client/petstore/python/dev-requirements.txt.log
 samples/client/petstore/python/swagger_client.egg-info/SOURCES.txt
 samples/client/petstore/python/.coverage
 samples/client/petstore/python/.projectile
-samples/client/petstore/python/.venv/
-samples/client/petstore/python-asyncio/.venv/
 samples/client/petstore/python-asyncio/.pytest_cache/
-samples/client/petstore/python-tornado/.venv/
+
 
 # PHP
 samples/client/petstore/php/OpenAPIClient-php/composer.lock

modules/openapi-generator/src/main/resources/python-flask/__init__model.mustache

@@ -1,7 +1,4 @@
-# coding: utf-8
-
 # flake8: noqa
-from __future__ import absolute_import
 # import models into model package
 {{#models}}{{#model}}from {{modelPackage}}.{{classFilename}} import {{classname}}{{/model}}
 {{/models}}

modules/openapi-generator/src/main/resources/python-flask/base_model.mustache

@@ -1,14 +1,13 @@
 import pprint
 
-import six
 import typing
 
 from {{packageName}} import util
 
 T = typing.TypeVar('T')
 
 
-class Model(object):
+class Model:
     # openapiTypes: The key is attribute name and the
     # value is attribute type.
     openapi_types: typing.Dict[str, type] = {}
@@ -29,7 +28,7 @@ class Model(object):
         """
         result = {}
 
-        for attr, _ in six.iteritems(self.openapi_types):
+        for attr in self.openapi_types:
             value = getattr(self, attr)
             if isinstance(value, list):
                 result[attr] = list(map(

modules/openapi-generator/src/main/resources/python-flask/controller.mustache

@@ -1,5 +1,4 @@
 import connexion
-import six
 from typing import Dict
 from typing import Tuple
 from typing import Union
@@ -97,15 +96,15 @@ def {{operationId}}({{#allParams}}{{paramName}}{{^required}}=None{{/required}}{{
             {{#items}}
                 {{#isDate}}
     if connexion.request.is_json:
-        {{paramName}} = {k: util.deserialize_date(v) for k, v in six.iteritems(connexion.request.get_json())}  # noqa: E501
+        {{paramName}} = {k: util.deserialize_date(v) for k, v in connexion.request.get_json().items()}  # noqa: E501
                 {{/isDate}}
                 {{#isDateTime}}
     if connexion.request.is_json:
-        {{paramName}} = {k: util.deserialize_datetime(v) for k, v in six.iteritems(connexion.request.get_json())}  # noqa: E501
+        {{paramName}} = {k: util.deserialize_datetime(v) for k, v in connexion.request.get_json().items()}  # noqa: E501
                 {{/isDateTime}}
                 {{#complexType}}
     if connexion.request.is_json:
-        {{paramName}} = {k: {{baseType}}.from_dict(v) for k, v in six.iteritems(connexion.request.get_json())}  # noqa: E501
+        {{paramName}} = {k: {{baseType}}.from_dict(v) for k, v in connexion.request.get_json().items()}  # noqa: E501
                 {{/complexType}}
             {{/items}}
         {{/isMap}}

modules/openapi-generator/src/main/resources/python-flask/controller_test.mustache

@@ -1,10 +1,6 @@
-# coding: utf-8
-
-from __future__ import absolute_import
 import unittest
 
 from flask import json
-from six import BytesIO
 
 {{#imports}}{{import}}  # noqa: E501
 {{/imports}}

modules/openapi-generator/src/main/resources/python-flask/encoder.mustache

@@ -1,5 +1,4 @@
 from connexion.apps.flask_app import FlaskJSONEncoder
-import six
 
 from {{modelPackage}}.base_model import Model
 
@@ -10,7 +9,7 @@ class JSONEncoder(FlaskJSONEncoder):
     def default(self, o):
         if isinstance(o, Model):
             dikt = {}
-            for attr, _ in six.iteritems(o.openapi_types):
+            for attr in o.openapi_types:
                 value = getattr(o, attr)
                 if value is None and not self.include_nulls:
                     continue

modules/openapi-generator/src/main/resources/python-flask/model.mustache

@@ -1,6 +1,3 @@
-# coding: utf-8
-
-from __future__ import absolute_import
 from datetime import date, datetime  # noqa: F401
 
 from typing import List, Dict  # noqa: F401

modules/openapi-generator/src/main/resources/python-flask/setup.mustache

@@ -1,5 +1,3 @@
-# coding: utf-8
-
 import sys
 from setuptools import setup, find_packages
 

modules/openapi-generator/src/main/resources/python-flask/typing_utils.mustache

@@ -1,5 +1,3 @@
-# coding: utf-8
-
 import sys
 
 if sys.version_info < (3, 7):

modules/openapi-generator/src/main/resources/python-flask/util.mustache

@@ -1,6 +1,5 @@
 import datetime
 
-import six
 import typing
 from {{packageName}} import typing_utils
 
@@ -16,7 +15,7 @@ def _deserialize(data, klass):
     if data is None:
         return None
 
-    if klass in six.integer_types or klass in (float, str, bool, bytearray):
+    if klass in (int, float, str, bool, bytearray):
         return _deserialize_primitive(data, klass)
     elif klass == object:
         return _deserialize_object(data)
@@ -45,7 +44,7 @@ def _deserialize_primitive(data, klass):
     try:
         value = klass(data)
     except UnicodeEncodeError:
-        value = six.u(data)
+        value = data
     except TypeError:
         value = data
     return value
@@ -110,7 +109,7 @@ def deserialize_model(data, klass):
     if not instance.openapi_types:
         return data
 
-    for attr, attr_type in six.iteritems(instance.openapi_types):
+    for attr, attr_type in instance.openapi_types.items():
         if data is not None \
                 and instance.attribute_map[attr] in data \
                 and isinstance(data, (list, dict)):
@@ -145,4 +144,4 @@ def _deserialize_dict(data, boxed_type):
     :rtype: dict
     """
     return {k: _deserialize(v, boxed_type)
-            for k, v in six.iteritems(data)}
+            for k, v in data.items() }