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）

 1 #
 2 # script to register Python 2.0 or later for use with win32all
 3 # and other extensions that require Python registry settings
 4 #
 5 # written by Joakim Loew for Secret Labs AB / PythonWare
 6 #
 7 # source:
 8 # http://www.pythonware.com/products/works/articles/regpy20.htm
 9 #
10 # modified by Valentine Gogichashvili as described in http://www.mail-archive.com/distutils-sig@python.org/msg10512.html
11 
12 import sys
13 
14 from _winreg import *
15 
16 # tweak as necessary
17 version = sys.version[:3]
18 installpath = sys.prefix
19 
20 regpath = "SOFTWARE\Python\Pythoncore\%s\" % (version)
21 installkey = "InstallPath"
22 pythonkey = "PythonPath"
23 pythonpath = "%s;%s\Lib\;%s\DLLs\" % (
24     installpath, installpath, installpath
25 )
26 
27 
28 def RegisterPy():
29     try:
30         reg = OpenKey(HKEY_CURRENT_USER, regpath)
31     except EnvironmentError as e:
32         try:
33             reg = CreateKey(HKEY_CURRENT_USER, regpath)
34             SetValue(reg, installkey, REG_SZ, installpath)
35             SetValue(reg, pythonkey, REG_SZ, pythonpath)
36             CloseKey(reg)
37         except:
38             print "*** Unable to register!"
39             return
40         print "--- Python", version, "is now registered!"
41         return
42     if (QueryValue(reg, installkey) == installpath and
43             QueryValue(reg, pythonkey) == pythonpath):
44         CloseKey(reg)
45         print "=== Python", version, "is already registered!"
46         return
47     CloseKey(reg)
48     print "*** Unable to register!"
49     print "*** You probably have another Python installation!"
50 
51 
52 if __name__ == "__main__":
53     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