@staticmethod
    def from_string(s):
        """Deserializes a token from a string like one returned by
        `to_string()`."""

        if not len(s):
            raise ValueError("Invalid parameter string.")

        params = parse_qs(s, keep_blank_values=False)
        if not len(params):
            raise ValueError("Invalid parameter string.")

        try:
            key = params['oauth_token'][0]
        except Exception:
            raise ValueError("'oauth_token' not found in OAuth request.")

        try:
            secret = params['oauth_token_secret'][0]
        except Exception:
            raise ValueError("'oauth_token_secret' not found in " 
                "OAuth request.")

        token = Token(key, secret)
        try:
            token.callback_confirmed = params['oauth_callback_confirmed'][0]
        except __HOLE__:
            pass  # 1.0, no callback confirmed.
        return token
dataset/ETHPy150Open ibagrak/algae/gae/libs/oauth2/__init__.py/Token.from_string