windows下python2和python3共存

1.将C:\Python34中的python.exe改名为python3.exe,同时将C:\Python34\Scripts中的pip.exe删除

效果图:

 

2.在环境变量PATH中添加:

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

 3.测试:

C:\Users\wanlifeipeng>python -V
Python 2.7.10

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

C:\Users\wanlifeipeng>pip -V
pip 9.0.1 from C:\Python27\lib\site-packages (python 2.7)

C:\Users\wanlifeipeng>pip3 -h
Fatal error in launcher: Unable to create process using '"C:\Python34\python.exe"

发现pip3 有些问题，其实只要升级一下就可以了

C:\Users\wanlifeipeng>python3 -m pip  install -U pip
C:\Users\wanlifeipeng>pip3 -V
pip 9.0.1 from C:\Python34\lib\site-packages (python 3.4)

至此大功告成。