windows環境下安裝Python2和Python3

知識預覽

1、Python安裝

2、pip安裝

 

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1.下載安裝包

https://www.python.org/ftp/python/2.7.14/python-2.7.14.amd64.msi    # 2.7安裝包

https://www.python.org/ftp/python/3.6.4/python-3.6.4-amd64.exe      # 3.6安裝包

 

2.安裝python3.6

增長環境變量

3.在命令行測試

 4.安裝Python2.7

 

5.將Python2增長到環境變量裏

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

6. 將C:\Python27目錄下的python.exe 和pythonw.exe 改成python2.exe 和pythonw2.exe 

7.將C:\Python36目錄下的python.exe 和pythonw.exe 改成python3.exe 和pythonw3.exe 

8.此時在命令行輸入python3表明python3  輸入python2表明python2

 

 

二. pip安裝

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#在cmd上執行

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