code: def versionstring(build=True, extra=True):
      """Returns the version number of Whoosh as a string.
  
      :param build: Whether to include the build number in the string.
      :param extra: Whether to include alpha/beta/rc etc. tags. Only
          checked if build is True.
      :rtype: str
      """
  
      if build:
          first = 3
      else:
          first = 2
  
      s = ".".join(str(n) for n in __version__[:first])
      if build and extra:
          s += "".join(str(n) for n in __version__[3:])
  
      return s
  
label_desc: Use image node_id 1 for calling a global function with example usage: versionstring(build, extra) and returns: s