validation.py 文件源码

def __init__(self, date_format: str, **kwargs):
        """
        :param date_format: The date format string to validate the column against. Refer to the date format code
            documentation at https://docs.python.org/3/library/datetime.html#strftime-and-strptime-behavior for a full
            list of format codes
        """
        self.date_format = date_format
        super().__init__(**kwargs)