[Python] add discard_unknown_keys parameter (#5362)

* add discard_unknown_key parameter

* add discard_unknown_key parameter

* add discard_unknown_key parameter

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* discard unknown keys in composed schema if configuration.discard_unknown_keys is set

* run sample scripts for python

* code reformatting

* execute script in bin directory

* improve unit tests for discarding properties

samples/client/petstore/python/petstore_api/configuration.py

@@ -37,6 +37,17 @@ class Configuration(object):
       The dict value is an API key prefix when generating the auth data.
     :param username: Username for HTTP basic authentication
     :param password: Password for HTTP basic authentication
+    :param discard_unknown_keys: Boolean value indicating whether to discard
+      unknown properties. A server may send a response that includes additional
+      properties that are not known by the client in the following scenarios:
+      1. The OpenAPI document is incomplete, i.e. it does not match the server
+         implementation.
+      2. The client was generated using an older version of the OpenAPI document
+         and the server has been upgraded since then.
+      If a schema in the OpenAPI document defines the additionalProperties attribute,
+      then all undeclared properties received by the server are injected into the
+      additional properties map. In that case, there are undeclared properties, and
+      nothing to discard.
 
     :Example:
 
@@ -75,6 +86,7 @@ class Configuration(object):
     def __init__(self, host="http://petstore.swagger.io:80/v2",
                  api_key=None, api_key_prefix=None,
                  username=None, password=None,
+                 discard_unknown_keys=False,
                  ):
         """Constructor
         """
@@ -104,6 +116,7 @@ class Configuration(object):
         self.password = password
         """Password for HTTP basic authentication
         """
+        self.discard_unknown_keys = discard_unknown_keys
         self.access_token = None
         """access token for OAuth/Bearer
         """