安装PIL库时提示python未注册错误（自定义python安装路径）

 import sys

 from _winreg import *

 # tweak as necessary
 version = sys.version[:3]
 installpath = sys.prefix
 regpath = "SOFTWARE\Python\Pythoncore\%s\\" % (version)
 installkey = "InstallPath"
 pythonkey = "PythonPath"
 pythonpath = "%s;%s\Lib\;%s\DLLs\\" % (
     installpath, installpath, installpath
 )

 def RegisterPy():
     try:
         reg = OpenKey(HKEY_CURRENT_USER, regpath)
     except EnvironmentError as e:
         try:
             reg = CreateKey(HKEY_CURRENT_USER, regpath)
             SetValue(reg, installkey, REG_SZ, installpath)
             SetValue(reg, pythonkey, REG_SZ, pythonpath)
             CloseKey(reg)
         except:
             print "*** Unable to register!"
             return
         print "--- Python", version, "is now registered!"
         return
     if (QueryValue(reg, installkey) == installpath and
         QueryValue(reg, pythonkey) == pythonpath):
         CloseKey(reg)
         print "=== Python", version, "is already registered!"
         return
     CloseKey(reg)
     print "*** Unable to register!"
     print "*** You probably have another Python installation!"
 RegisterPy()

将以上代码运行一下注册一下现有的路径即可安装PIL了

PIL下载地址：http://pythonware.com/products/pil/