def week_date(self, start: int = 2017, end: int = 2018) -> str:
        """Get week number with year.

        :param start: From start.
        :param end: To end.
        :return: Week number.
        """
        year = self.year(start, end)
        week = self.random.randint(1, 52)
        return '{year}-W{week}'.format(
            year=year,
            week=week,
        )
Get week number with year.

        :param start: From start.
        :param end: To end.
        :return: Week number.