windows环境下安装Python2和Python3

知识预览

1、Python安装

2、pip安装

 

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1.下载安装包

https://www.python.org/ftp/python/2.7.14/python-2.7.14.amd64.msi    # 2.7安装包

https://www.python.org/ftp/python/3.6.4/python-3.6.4-amd64.exe      # 3.6安装包

 

2.安装python3.6

增长环境变量

3.在命令行测试

 4.安装Python2.7

 

5.将Python2增长到环境变量里

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

6. 将C:\Python27目录下的python.exe 和pythonw.exe 改成python2.exe 和pythonw2.exe 

7.将C:\Python36目录下的python.exe 和pythonw.exe 改成python3.exe 和pythonw3.exe 

8.此时在命令行输入python3表明python3  输入python2表明python2

 

 

二. pip安装

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#在cmd上执行

python3 -m pip install --upgrade pip --force-reinstall

python2 -m pip install --upgrade pip --force-reinstall

 

#查看pip版本

pip3   -V

pip2   -V