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_MACHINESOFTWAREPythonPythonCore2.7InstallPath路径下的值，复制到HKEY_LOCAL_MACHINESOFTWAREWow6432NodePythonPythonCore2.7InstallPath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_MACHINESOFTWAREWow6432NodePythonPythonCore2.7InstallPath路径下寻找Python。但是装好的64位Python在HKEY_LOCAL_MACHINESOFTWAREPythonPythonCore2.7InstallPath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()