code: def trading_dates(start, end, calendar='US'):
      
      kw = dict(start=pd.Timestamp(start, tz='UTC').date(), end=pd.Timestamp(end, tz='UTC').date())
      us_cal = getattr(sys.modules[__name__], f'{calendar}TradingCalendar')()
      return pd.bdate_range(**kw).drop(us_cal.holidays(**kw))
docs: Trading dates for given exchange
  
      Args:
          start: start date
          end: end date
          calendar: exchange as string
  
      Returns:
          pd.DatetimeIndex: datetime index
  
      Examples:
          >>> bus_dates = ['2018-12-24', '2018-12-26', '2018-12-27']
          >>> trd_dates = trading_dates(start='2018-12-23', end='2018-12-27')
          >>> assert len(trd_dates) == len(bus_dates)
          >>> assert pd.Series(trd_dates == pd.DatetimeIndex(bus_dates)).all()