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, Credentials):
            raise db.BadValueError('Property %s must be convertible '
                                   'to a Credentials instance (%s)' %
                                   (self.name, value))
        return value