Update python default value (#360)

* update pythong default value

* fix example, update python sample

* update python petstore sample (asyncio, tornado)

samples/client/petstore/python-asyncio/setup.py

@@ -1,13 +1,12 @@
 # coding: utf-8
 
 """
-    Swagger Petstore
+    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: \" \\  # noqa: E501
 
     OpenAPI spec version: 1.0.0
-    Contact: apiteam@swagger.io
-    Generated by: https://github.com/swagger-api/swagger-codegen.git
+    Generated by: https://openapi-generator.tech
 """
 
 
@@ -28,10 +27,10 @@ REQUIRES.append("aiohttp")
 setup(
     name=NAME,
     version=VERSION,
-    description="Swagger Petstore",
-    author_email="apiteam@swagger.io",
+    description="OpenAPI Petstore",
+    author_email="",
     url="",
-    keywords=["Swagger", "Swagger Petstore"],
+    keywords=["OpenAPI", "OpenAPI-Generator", "OpenAPI Petstore"],
     install_requires=REQUIRES,
     packages=find_packages(),
     include_package_data=True,