code: def upcoming_shabbat(self):
          
          if self.is_shabbat:
              return self
          # If it's Sunday, fast forward to the next Shabbat.
          saturday = self.gdate + datetime.timedelta(
              (12 - self.gdate.weekday()) % 7)
          return HDate(saturday, diaspora=self.diaspora, hebrew=self.hebrew)
docs: Return the HDate for either the upcoming or current Shabbat.
  
          If it is currently Shabbat, returns the HDate of the Saturday.