def validate(self, value):
    value = super(CredentialsProperty, self).validate(value)
    logging.info("validate: Got type " + str(type(value)))
    if value is not None and not isinstance(value, Credentials):
      raise db.BadValueError('Property %s must be convertible '
                          'to a Credentials instance (%s)' +
                            (self.name, value))
    #if value is not None and not isinstance(value, Credentials):
    #  return None
    return value
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/google-api-python-client/oauth2client/appengine.py/CredentialsProperty.validate/operator `%` -> `+`