appengine.py 文件源码

def validate(self, value):
        value = super(CredentialsProperty, self).validate(value)
        logger.info("validate: Got type " + str(type(value)))
        if value is not None and not isinstance(value, client.Credentials):
            raise db.BadValueError(
                'Property {0} must be convertible '
                'to a Credentials instance ({1})'.format(self.name, value))
        return value