@_helpers.positional(<NUM_LIT:2>)<EOL><INDENT>def __init__(self, assertion_type, user_agent=None,<EOL>token_uri=oauth2client.GOOGLE_TOKEN_URI,<EOL>revoke_uri=oauth2client.GOOGLE_REVOKE_URI,<EOL>**unused_kwargs):<DEDENT>
super(AssertionCredentials, self).__init__(<EOL>None,<EOL>None,<EOL>None,<EOL>None,<EOL>None,<EOL>token_uri,<EOL>user_agent,<EOL>revoke_uri=revoke_uri)<EOL>self.assertion_type = assertion_type<EOL>
Constructor for AssertionFlowCredentials.

        Args:
            assertion_type: string, assertion type that will be declared to the
                            auth server
            user_agent: string, The HTTP User-Agent to provide for this
                        application.
            token_uri: string, URI for token endpoint. For convenience defaults
                       to Google's endpoints but any OAuth 2.0 provider can be
                       used.
            revoke_uri: string, URI for revoke endpoint.