code: def is_working_day(self, day,
                         extra_working_days=None, extra_holidays=None):
          
          day = cleaned_date(day)
          if extra_working_days:
              extra_working_days = tuple(map(cleaned_date, extra_working_days))
          if extra_holidays:
              extra_holidays = tuple(map(cleaned_date, extra_holidays))
  
          # Extra lists exceptions
          if extra_working_days and day in extra_working_days:
              return True
  
          # Regular rules
          if day.weekday() in self.get_weekend_days():
              return False
  
          return not self.is_holiday(day, extra_holidays=extra_holidays)
docs: Return True if it's a working day.
          In addition to the regular holidays, you can add exceptions.
  
          By providing ``extra_working_days``, you'll state that these dates
          **are** working days.
  
          By providing ``extra_holidays``, you'll state that these dates **are**
          holidays, even if not in the regular calendar holidays (or weekends).
  
          Please note that the ``extra_working_days`` list has priority over the
          ``extra_holidays`` list.