code: def __init__(self, ticker, session=None, proxy=None):
      super(Ticker, self).__init__(ticker, session=session, proxy=proxy)
      self._expirations = {}
      self._underlying = {}
  
imports: from __future__ import print_function
  import datetime
  from collections import namedtuple
  import pandas
  from .base import TickerBase
label_desc: Use image node_id 1 to create a new Ticker object from inherited base classes: TickerBase with example: obj = Ticker(ticker, session, proxy)