Python version 2.7 required, which was not found in the registry

安装pil库的时候，直接提示：python version 2.7 required, which was not found in the registry。
如图：

大意是说找不到注册表，网上搜索解决方案。

新建一个register.py文件写入代码：

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!"

启动命令切到register.py文件目录下执行:

重新安装pil，错误解决，安装成功。

如果是win7 64位的用户在安装python 32位程序时，如果选择只为当前用户，以上问题不会出现。如果选择所有用户，就试着使用以上方法解决。

提示其它版本解决方法类似。