old_contents: """Add Python to the search path on Windows
  
  This is a simple script to add Python to the Windows search path. It
  modifies the current user (HKCU) tree of the registry.
  
  Copyright (c) 2008 by Christian Heimes <christian@cheimes.de>
  Licensed to PSF under a Contributor Agreement.
  """
  
  import sys
  import site
  import os
  import winreg
  
  HKCU = winreg.HKEY_CURRENT_USER
  ENV = "Environment"
  PATH = "PATH"
  DEFAULT = u"%PATH%"
  
  def modify():
      pythonpath = os.path.dirname(os.path.normpath(sys.executable))
      scripts = os.path.join(pythonpath, "Scripts")
      appdata = os.environ["APPDATA"]
      if hasattr(site, "USER_SITE"):
          userpath = site.USER_SITE.replace(appdata, "%APPDATA%")
          userscripts = os.path.join(userpath, "Scripts")
      else:
          userscripts = None
  
      with winreg.CreateKey(HKCU, ENV) as key:
          try:
              envpath = winreg.QueryValueEx(key, PATH)[0]
          except WindowsError:
              envpath = DEFAULT
  
          paths = [envpath]
          for path in (pythonpath, scripts, userscripts):
              if path and path not in envpath and os.path.isdir(path):
                  paths.append(path)
  
          envpath = os.pathsep.join(paths)
          winreg.SetValueEx(key, PATH, 0, winreg.REG_EXPAND_SZ, envpath)
          return paths, envpath
  
  def main():
      paths, envpath = modify()
      if len(paths) > 1:
          print("Path(s) added:")
          print('\n'.join(paths[1:]))
      else:
          print("No path was added")
      print("\nPATH is now:\n%s\n" % envpath)
      print("Expanded:")
      print(winreg.ExpandEnvironmentStrings(envpath))
  
  if __name__ == '__main__':
      main()
  
new_contents: """Add Python to the search path on Windows
  
  This is a simple script to add Python to the Windows search path. It
  modifies the current user (HKCU) tree of the registry.
  
  Copyright (c) 2008 by Christian Heimes <christian@cheimes.de>
  Licensed to PSF under a Contributor Agreement.
  """
  
  import sys
  import site
  import os
  import winreg
  
  HKCU = winreg.HKEY_CURRENT_USER
  ENV = "Environment"
  PATH = "PATH"
  DEFAULT = "%PATH%"
  
  def modify():
      pythonpath = os.path.dirname(os.path.normpath(sys.executable))
      scripts = os.path.join(pythonpath, "Scripts")
      appdata = os.environ["APPDATA"]
      if hasattr(site, "USER_SITE"):
          userpath = site.USER_SITE.replace(appdata, "%APPDATA%")
          userscripts = os.path.join(userpath, "Scripts")
      else:
          userscripts = None
  
      with winreg.CreateKey(HKCU, ENV) as key:
          try:
              envpath = winreg.QueryValueEx(key, PATH)[0]
          except WindowsError:
              envpath = DEFAULT
  
          paths = [envpath]
          for path in (pythonpath, scripts, userscripts):
              if path and path not in envpath and os.path.isdir(path):
                  paths.append(path)
  
          envpath = os.pathsep.join(paths)
          winreg.SetValueEx(key, PATH, 0, winreg.REG_EXPAND_SZ, envpath)
          return paths, envpath
  
  def main():
      paths, envpath = modify()
      if len(paths) > 1:
          print("Path(s) added:")
          print('\n'.join(paths[1:]))
      else:
          print("No path was added")
      print("\nPATH is now:\n%s\n" % envpath)
      print("Expanded:")
      print(winreg.ExpandEnvironmentStrings(envpath))
  
  if __name__ == '__main__':
      main()
  
subject: Fix unicode literal.