code: def __hash__(self):
      return hash(self._key)
  
imports: from __future__ import absolute_import, division, print_function
  from copy import deepcopy
  from attr import attrs, attrib
  import re
  import six
label_desc: Use image node_id 2 for calling the _BaseVersion obj's underlying member method code with example usage: obj.__hash__() and returns: hash