validators.py 文件源码

def __call__(self, value):

        if value is None or isinstance(value, list):
            return value

        try:
            value = csv.reader([value], self.Dialect).next()
        except csv.Error as error:
            raise ValueError(error)

        if self._validator is None:
            return value

        try:
            for index, item in enumerate(value):
                value[index] = self._validator(item)
        except ValueError as error:
            raise ValueError('Could not convert item {}: {}'.format(index, error))

        return value