train.py 文件源码

def _valid_date(self):
        """Check and return a valid query date."""
        date = self._parse_date(self.date)

        if not date:
            exit_after_echo(INVALID_DATE)

        try:
            date = datetime.datetime.strptime(date, '%Y%m%d')
        except ValueError:
            exit_after_echo(INVALID_DATE)

        # A valid query date should within 50 days.
        offset = date - datetime.datetime.today()
        if offset.days not in range(-1, 50):
            exit_after_echo(INVALID_DATE)

        return date.strftime('%Y-%m-%d')
        # return datetime.date.strftime(date, '%Y-%m-%d')