python2 version: 2.7.16
python3 version: 3.7.4
Note: To install python3, you need to type win7 sp1 patch! Install python3 requires win7 sp1 patch! Install python3 requires win7 sp1 patch!
1. Install python2.7.16
Normal installation, set the environment variable after installation:
C:\Python27 C:\Python27\Scripts
Then name the python.exe in the C:\Python27 directory as python2.exe
2, install python3
Normal installation, set environment variables after installation:
C:\Python37 C:\Python37\Scripts
Then name the python.exe in the C:\Python37 directory as python3.exe
3. Reinstall pip
python3 -m pip install --upgrade pip --force-reinstall python2 -m pip install --upgrade pip --force-reinstall
C:\Python27 C:\Python27\Scripts
C:\Python37 C:\Python37\Scripts
python3 -m pip install --upgrade pip --force-reinstall python2 -m pip install --upgrade pip --force-reinstall