code: def base_version(self):
      parts = []
  
      # Epoch
      if self.epoch != 0:
          parts.append("{0}!".format(self.epoch))
  
      # Release segment
      parts.append(".".join(str(x) for x in self.release))
  
      return "".join(parts)
  
imports: from __future__ import absolute_import, division, print_function
  import collections
  import itertools
  import re
  from ._structures import Infinity
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