Install Python 2 & amp; Python3 cmd and install Python 2.

Install Python 2 and Python 3 cmd.

System: win7

Bytes

In this way, enter python directly in cmd and automatically execute python27.

After searching for solutions on the internet, I changed the names of the two python.exe files to python2 and python3 respectively.

However, this will create a lot of questions. For example, when running idle, python27will automatically re-create a python.exe file... That is to say, you have also changed it.

Finally, find a reasonable solution: Use python parameters to differentiate

Python2 usage

Py-2

Python3 usage

Py-3

It perfectly solves the problem of arbitrary python version Selection in cmd.