def string(value):
    if value is not None:
        return str(value)
    raise vol.Invalid('string value is None')
Authorize a gdata.client.GDClient instance with these credentials.
dataset/ETHPy150Open home-assistant/home-assistant/homeassistant/helpers/config_validation.py/string--crossover with--dataset/ETHPy150Open acil-bwh/SlicerCIP/Scripted/attic/PicasaSnap/gdata/gauth.py/OAuth2Token.authorize