code: def local(self) -> Optional[str]:
      if self._version.local:
          return ".".join(str(x) for x in self._version.local)
      else:
          return None
  
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 9 for calling the Version obj's underlying member method code with example usage: obj.local() and returns: str, None