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/README.md

@@ -1,7 +1,7 @@
 # petstore-api
 This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
 
-This Python package is automatically generated by the [Swagger Codegen](https://github.com/swagger-api/swagger-codegen) project:
+This Python package is automatically generated by the [OpenAPI Generator](https://openapi-generator.tech) project:
 
 - API version: 1.0.0
 - Package version: 1.0.0
@@ -50,8 +50,9 @@ import time
 import petstore_api
 from petstore_api.rest import ApiException
 from pprint import pprint
+
 # create an instance of the API class
-api_instance = petstore_api.AnotherFakeApi()
+api_instance = petstore_api.AnotherFakeApi(petstore_api.ApiClient(configuration))
 client = petstore_api.Client() # Client | client model
 
 try:
@@ -131,11 +132,8 @@ Class | Method | HTTP request | Description
  - [Name](docs/Name.md)
  - [NumberOnly](docs/NumberOnly.md)
  - [Order](docs/Order.md)
- - [OuterBoolean](docs/OuterBoolean.md)
  - [OuterComposite](docs/OuterComposite.md)
  - [OuterEnum](docs/OuterEnum.md)
- - [OuterNumber](docs/OuterNumber.md)
- - [OuterString](docs/OuterString.md)
  - [Pet](docs/Pet.md)
  - [ReadOnlyFirst](docs/ReadOnlyFirst.md)
  - [SpecialModelName](docs/SpecialModelName.md)
@@ -174,5 +172,5 @@ Class | Method | HTTP request | Description
 
 ## Author
 
-apiteam@swagger.io
+