What is the use of the subprocess module

It's like python Open one inside cmd window , And do what you're doing cmd It does the same thing inside

Like watching a movie ip Well ,cmd Namely ipconfig , It should be known

And then in python Just do it like this in the

This is the simplest one , But if you want to do some fancy work , For example, you are in cmd,ping When a website is accessed, it will be displayed line by line in real time . So you want to python Let him come out in real time , The first method is definitely not feasible . So it can be like this .

  So he can update it in real time . Just stop the program when you want to close it .. But where it is marked in red, I should have typed utf-8 Of But there was an error . Later it was replaced by gbk Just fine . Maybe everyone is different , You can try whichever line you use

Python3 error ：UnicodeDecodeError: 'utf-8' codec can't decode byte 0xd5 resolvent _polyhedronx The blog of -CSDN Blog

This is a link to help me solve the problem , Thanks to this friend