win下python2与python3共存

1.先下载py2和py3   2.添加环境变量       3.在Path（系统变量）添加值（中间要分号隔开）:   1.c:\Python27 2.c:\Python27\Scripts 3.C:\Users\Administrator\AppData\Local\Programs\Python\Python36 4.C:\Users\Administrator\AppData\Local\Pr

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