安装mysql在check requirements 出现问题 不能继续安装 the requirement is still failing，检测python未安装

原因是重装系统，E盘的python配置到环境变量后，python可以正常使用，但是mysql见此依然说没安装python，

可能是mysql在安装的时候，不是检查环境变量，而是检查注册表。

去注册表路径看看是否 有python

 HKEY_CURRENT_USER\Software\Python\

用python注册注册表；运行下面代码

1.  
   import sys
2.  
    
3.  
   from winreg import *
4.  
    
5.  
   # tweak as necessary
6.  
   version = sys.version[:4]
7.  
   installpath = sys.prefix
8.  
    
9.  
   regpath = "SOFTWARE\\Python\\Pythoncore\\%s\\" % (version)
10.  
    installkey = "InstallPath"
11.  
    pythonkey = "PythonPath"
12.  
    pythonpath = "%s;%s\\Lib\\;%s\\DLLs\\" % (
13.  
    installpath, installpath, installpath
14.  
    )
15.  
     
16.  
    def RegisterPy():
17.  
    try:
18.  
    reg = OpenKey(HKEY_CURRENT_USER, regpath)
19.  
    except EnvironmentError as e:
20.  
    try:
21.  
    reg = CreateKey(HKEY_CURRENT_USER, regpath)
22.  
    SetValue(reg, installkey, REG_SZ, installpath)
23.  
    SetValue(reg, pythonkey, REG_SZ, pythonpath)
24.  
    CloseKey(reg)
25.  
    except:
26.  
    print("*** Unable to register!")
27.  
    return
28.  
    print("--- Python", version, "is now registered!")
29.  
    return
30.  
    if (QueryValue(reg, installkey) == installpath and
31.  
    QueryValue(reg, pythonkey) == pythonpath):
32.  
    CloseKey(reg)
33.  
    print("=== Python", version, "is already registered!")
34.  
    return
35.  
    CloseKey(reg)
36.  
    print("*** Unable to register!")
37.  
    print("*** You probably have another Python installation!")
38.  
     
39.  
    if __name__ == "__main__":
40.  
    RegisterPy()

这样注册表中就有python了，检测就通过了。