code: def __le__(self, other: "_BaseVersion") -> bool:
      if not isinstance(other, _BaseVersion):
          return NotImplemented
  
      return self._key <= other._key
  
imports: import collections
  import itertools
  import re
  from typing import Callable, Optional, SupportsInt, Tuple, Union
  from ._structures import Infinity, InfinityType, NegativeInfinity, NegativeInfinityType
label_desc: Use image node_id 3 for calling the _BaseVersion obj's underlying member method code with example usage: obj.__le__(other) and returns: unknown, NotImplemented