code: def name(self):
      return "OPEN"
  
file_path: catalyst/catalyst/utils/calendars/exchange_calendar_open.py
imports: from datetime import time
  from pytz import timezone
  from pandas import Timestamp
  from pandas.tseries.offsets import DateOffset
  from catalyst.utils.memoize import lazyval
  from .trading_calendar import TradingCalendar
label_desc: Use image node_id 1 for calling the OpenExchangeCalendar obj's underlying member method code with example usage: obj.name() and returns: str