code: def __str__(self):
      parts = []
  
      # Epoch
      if self._version.epoch != 0:
          parts.append("{0}!".format(self._version.epoch))
  
      # Release segment
      parts.append(".".join(str(x) for x in self._version.release))
  
      # Pre-release
      if self._version.pre is not None:
          parts.append("".join(str(x) for x in self._version.pre))
  
      # Post-release
      if self._version.post is not None:
          parts.append(".post{0}".format(self._version.post[1]))
  
      # Development release
      if self._version.dev is not None:
          parts.append(".dev{0}".format(self._version.dev[1]))
  
      # Local version segment
      if self._version.local is not None:
          parts.append(
              "+{0}".format(
                  ".".join(str(x) for x in self._version.local)
              )
          )
  
      return "".join(parts)
  
imports: import collections
  import itertools
  import re
label_desc: Use image node_id 3 for calling the Version obj's underlying member method code with example usage: obj.__str__() and returns: str