old_contents: import os
  import sys
  
  is_py2 = (sys.version_info[0] == 2)
  is_py3 = (sys.version_info[0] == 3)
  is_py33 = (sys.version_info[0] == 3 and sys.version_info[1] == 3)
  is_win32 = os.name == "nt"
  
  if is_py2:
      _str = str
      str = unicode
      range = xrange
  
      def bytes(b, enc="ascii"):
          return _str(b)
  
  elif is_py3:
      bytes = bytes
      str = str
      range = range
  
  try:
      from urllib.parse import urlparse, urljoin, quote, unquote, parse_qsl
      import queue
  except ImportError:
      from urlparse import urlparse, urljoin, parse_qsl
      from urllib import quote, unquote
      import Queue as queue
  
  __all__ = ["is_py2", "is_py3", "is_py33", "is_win32", "str", "bytes",
             "urlparse", "urljoin", "parse_qsl", "quote", "unquote", "queue",
             "range"]
  
new_contents: import os
  import sys
  
  is_py2 = (sys.version_info[0] == 2)
  is_py3 = (sys.version_info[0] == 3)
  is_py33 = (sys.version_info[0] == 3 and sys.version_info[1] == 3)
  is_win32 = os.name == "nt"
  
  if is_py2:
      _str = str
      str = unicode
      range = xrange
  
      def bytes(b, enc="ascii"):
          return _str(b)
  
  elif is_py3:
      bytes = bytes
      str = str
      range = range
  
  try:
      from urllib.parse import (
          urlparse, urlunparse, urljoin, quote, unquote, parse_qsl
      )
      import queue
  except ImportError:
      from urlparse import urlparse, urlunparse, urljoin, parse_qsl
      from urllib import quote, unquote
      import Queue as queue
  
  __all__ = ["is_py2", "is_py3", "is_py33", "is_win32", "str", "bytes",
             "urlparse", "urlunparse", "urljoin", "parse_qsl", "quote",
             "unquote", "queue", "range"]
  
subject: Add urlunparse.