python2和python3 windows下共存

0）无脑安装python2，python3

下载地址：[www.python.org]

1）环境变量PATH

C:\Python27;C:\Python27\Scripts;C:\Python34;C:\Python34\Scripts;

2）python3*安装路径下可执行文件名变更

python.exe----> python3.exe
pip.exe---->pip.exe-[OFF]

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3)升级python3的pip版本

python3 -m pip install -U pip

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4)验证

C:\Users\kj>python -V
Python 2.7.2

C:\Users\kj>python3 -V
Python 3.4.3

C:\Users\kj>pip -V
pip 8.1.1 from C:\Python27\lib\site-packages\pip-8.1.1-py2.7
.egg (python 2.7)

C:\Users\kj>pip3 -V
pip 18.1 from C:\Python34\lib\site-packages\pip (python 3.4)