Login to Google API using OAuth2 credentials.
    This is a shortcut function which
    instantiates :class:`gspread.client.Client`
    and performs login right away.

    :returns: :class:`gspread.Client` instance.

def authorize(credentials, client_class=Client):
    """Login to Google API using OAuth2 credentials.
    This is a shortcut function which
    instantiates :class:`gspread.client.Client`
    and performs login right away.

    :returns: :class:`gspread.Client` instance.
    """
    client = client_class(auth=credentials)
    client.login()
    return client