Does the old project run on run server?

Question

PHP

The problem is this:
First we successfully start the "First" project at 127.0.0.1:8000 from Pycharm,
then we start the "Second" project at the same address and port.
Tell me why the first project is opening again?
It is clear that you can change the port number, but how to run on the same port 8000?

Answer 1

who taught how to get the number of lines?