安装pywin32时，出现找不到python27注册信息的解决方法

1. 检查一下注册表是否存在python其它版本的信息

方法：

1）在命令行中输入regedit打开注册表

2）在HKEY_CURRENT_USERSoftware中找一下是否存在python注册信息，如果存在，检查一下是否是python27版本，且是否包含下面两个节点

再检查一下其对于的安装路径是否正确。如果不知道如何检查，可以把python节点信息右击选择删除。如果python注册信息不存在，这里就不用操作了。

2.新建register.py文件，复制如下代码保存在D盘根目录下，cmd命令行运行 python register.py，当输出“python 2.7 is already registered”就ok了

（python27使用正常，无需修改任何内容）

#
# script to register Python 2.0 or later for use with win32all
# and other extensions that require Python registry settings
#
# written by Joakim Loew for Secret Labs AB / PythonWare
#
# source:
# http://www.pythonware.com/products/works/articles/regpy20.htm
#
# modified by Valentine Gogichashvili as described in http://www.mail-archive.com/distutils-sig@python.org/msg10512.html

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!"


if __name__ == "__main__":
    RegisterPy()

3.执行后再检查一下注册表。python27的注册信息已经存在了

4. 再次安装pywin32-220.win32-py2.7.exe，结果安装成功