code: def render(pieces, style):
      
      if pieces["error"]:
          return {"version": "unknown",
                  "full-revisionid": pieces.get("long"),
                  "dirty": None,
                  "error": pieces["error"],
                  "date": None}
  
      if not style or style == "default":
          style = "pep440"  # the default
  
      if style == "pep440":
          rendered = render_pep440(pieces)
      elif style == "pep440-pre":
          rendered = render_pep440_pre(pieces)
      elif style == "pep440-post":
          rendered = render_pep440_post(pieces)
      elif style == "pep440-old":
          rendered = render_pep440_old(pieces)
      elif style == "pep440-branch-based":
          rendered = render_pep440_branch_based(pieces)
      elif style == "git-describe":
          rendered = render_git_describe(pieces)
      elif style == "git-describe-long":
          rendered = render_git_describe_long(pieces)
      else:
          raise ValueError("unknown style '%s'" % style)
  
      return {"version": rendered, "full-revisionid": pieces["long"],
              "dirty": pieces["dirty"], "error": None,
              "date": pieces.get("date")}
docs: Render the given version pieces into the requested style.