code: def week_date(self, start: int = 2017, end: int = 2018) -> str:
          
          year = self.year(start, end)
          week = self.random.randint(1, 52)
          return '{year}-W{week}'.format(
              year=year,
              week=week,
          )
docs: Get week number with year.
  
          :param start: From start.
          :param end: To end.
          :return: Week number.