64位系统装32位的Python，Python version 3.5 required, which was not found，DLL load failed

     64位系统装了32位的Python，安装exe格式对应python版本相关的包，报错：Python version 3.5 required, which was not found in the registry。

     原因是注册表缺少Python安装信息，安装时，要注意选择。

64位系统32位Python，如果使用pywin32出现DLL load failed

复制文件夹  

C:\Program Files (x86)\Python36-32\Lib\site-packages\pywin32_system32\

内的文件：
            pythoncom36.dll
            pywintypes36.dll
到文件夹
C:\Windows\SysWOW64\

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1.右键安装包，“以管理员权限运行”

2.勾选“add Python 3.5 to PATH”，选择“customize installation”。

3.注意，勾选“for all users”就需要管理员权限运行。

4.勾选“Install for all users”，安装。

当然，你也可以选择使用下面了py脚本来添加Python安装信息：

import sys    from _winreg import *       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()