Python 3.9 is now generally available.

google.appengine.api.oauth.get_client_id

Returns the value of OAuth2 Client ID from an OAuth2 request.

_scope The custom OAuth scope or an iterable of scopes at least one of which is accepted.

string The value of Client ID.

OAuthRequestError The request was not a valid OAuth2 request.
OAuthServiceFailureError An unknown error occurred.