code: def this_week(today: datetime=None, tz=None):
      
      if today is None:
          today = datetime.utcnow()
      begin = today - timedelta(days=today.weekday())
      begin = datetime(year=begin.year, month=begin.month, day=begin.day)
      return localize_time_range(begin, begin + timedelta(days=7), tz)
docs: Returns this week begin (inclusive) and end (exclusive).
      :param today: Some date (defaults current datetime)
      :param tz: Timezone (defaults pytz UTC)
      :return: begin (inclusive), end (exclusive)