code: def sessions(self):
      return self.trading_calendar.sessions_in_range(
          self.first_trading_day, self.last_available_dt
      )
  
imports: from abc import ABCMeta, abstractmethod
  from numpy import full, nan, int64, zeros
  from six import iteritems, with_metaclass
  from zipline.utils.memoize import lazyval
label_desc: Use image node_id 2 for calling the AssetDispatchSessionBarReader obj's underlying member method code with example usage: obj.sessions() and returns: self