Python2 and Python3 coexistence under Windows installation

One, Python installation 1. Download the installation package

　　　　

1 https://www.python.org/ftp/python/2.7.14/python-2.7.14.amd64.msi    #  2.7 installation package 2   3 https://www.python.org/ftp/python/3.6.4/python-3.6.4-amd64.exe      #  3.6 installation Package 

2. Installing Python3.6

3. Test under the command line

4. Installing python2.7

5. Add Python2 to environment variables

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

6. Change Python.exe and Pythonw.exe under the C:\Python27 directory to Python2.exe and Pythonw2.exe

7. Change Python.exe and Pythonw.exe under the C:\Python36 directory to Python3.exe and Pythonw3.exe

8. At this point, enter Python3 on the command line to represent Python3 input Python2 representative Python2

Second, the installation of PIP

1 #  2 python3-m pip install--upgrade pip--force-Reinstall3 python2-m pip install--upg Rade pip--force-Reinstall4  5  6# view pip version 7  8 PIP3-V9 pip2-v

Python2 and Python3 coexistence under Windows installation