code: def __hash__(self) -> int:
      return hash(self._key)
  
imports: import collections
  import itertools
  import re
  import warnings
  from typing import Callable, Iterator, List, Optional, SupportsInt, Tuple, Union
  from ._structures import Infinity, InfinityType, NegativeInfinity, NegativeInfinityType
label_desc: Use image node_id 1 for calling the _BaseVersion obj's underlying member method code with example usage: obj.__hash__() and returns: hash