code: def options(self) -> tuple:
      if not self._expirations:
          self._download_options()
      return tuple(self._expirations.keys())
  
imports: from __future__ import print_function
  import datetime
  from collections import namedtuple
  import pandas
  from .base import TickerBase
label_desc: Use image node_id 43 for calling the Ticker obj's underlying member method code with example usage: obj.options() and returns: tuple