code: def base_version(self) -> str:
      parts = []
  
      # Epoch
      if self.epoch != 0:
          parts.append(f"{self.epoch}!")
  
      # Release segment
      parts.append(".".join(str(x) for x in self.release))
  
      return "".join(parts)
  
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 11 for calling the Version obj's underlying member method code with example usage: obj.base_version() and returns: str