gmail_reader.py 文件源码

def _get_credentials(self):
        """Gets valid user credentials from storage.

        If nothing has been stored, or if the stored credentials are invalid,
        the OAuth2 flow is completed to obtain the new credentials.

        Returns:
            Credentials, the obtained credential.
        """

        store = Storage(self._credentials_file)
        credentials = store.get()
        if not credentials or credentials.invalid:
            raise Exception(
                "Could not find Google Mail credentials at %s" % self._credentials_file)
        return credentials