windows 多Python 配置

1.环境变量

2.在cmd 命令行中使用 py -2 使用python27

  在 cmd 命令行中使用 py -3 使用python35

C:Users*****>py -3
 Python 3.5.4 (v3.5.4:3f56838, Aug 8 2017, 02:17:05) [MSC v.1900 64 bit (AMD64)] on win32
 Type "help", "copyright", "credits" or "license" for more information.
 >>>

C:Users******>py -2
 Python 2.7.13 (v2.7.13:a06454b1afa1, Dec 17 2016, 20:53:40) [MSC v.1500 64 bit (AMD64)] on win32
 Type "help", "copyright", "credits" or "license" for more information.
 >>>

3.使用pip时安装module

py -2 -m pip install xxx # python 27

py -3 -m pip install xxx # python 35