Python version 2.7， which was not found in the registry

在安装部分Python包时会出现问题：明明已经安装了Python2.7，但无法在注册表相关位置找不到，那该怎么感觉该问题呢？

首先检查你的系统位数，位数不同，解决方案不一样。

1）32位系统：在cmd输入regedit然后将HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\2.7\InstallPath路径下的值，复制到HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Python\PythonCore\2.7\InstallPath路径下，当然没有路径的话一定要新建起来。然后就可以安装了。本解决方案适用于只提供了32位安装包的库。

原因：Python的一些第三方库只到注册表的HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Python\PythonCore\2.7\InstallPath路径下寻找Python。但是装好的64位Python在HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\2.7\InstallPath路径下建立Python的信息。

2）64位系统：将Python2.7加入到注册表中。可以通过运行下面代码：

 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():

     print "begin RegisterPy "

     try:

         print "open key : %s"%regpath

         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 "*** EXCEPT: 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 "*** ERROR:Unable to register!"

     print "*** REASON:You probably have another Python installation!"

 def UnRegisterPy():

     #print "begin UnRegisterPy "

     try:

         print "open HKEY_CURRENT_USER key=%s"%(regpath)

         reg = OpenKey(HKEY_CURRENT_USER, regpath)

         #reg = OpenKey(HKEY_LOCAL_MACHINE, regpath)

     except EnvironmentError:

         print "*** Python not registered?!"

         return

     try:

        DeleteKey(reg, installkey)

        DeleteKey(reg, pythonkey)

        DeleteKey(HKEY_LOCAL_MACHINE, regpath)

     except:

        print "*** Unable to un-register!"

     else:

        print "--- Python", version, "is no longer registered!"

 if __name__ == "__main__":

     RegisterPy()