code: def render_pep440_pre(pieces):
      
      if pieces["closest-tag"]:
          rendered = pieces["closest-tag"]
          if pieces["distance"]:
              rendered += ".post.dev%d" % pieces["distance"]
      else:
          # exception #1
          rendered = "0.post.dev%d" % pieces["distance"]
      return rendered
docs: TAG[.post.devDISTANCE] -- No -dirty.
  
      Exceptions:
      1: no tags. 0.post.devDISTANCE