Try this command:
ps -ef | grep python
ps stands for process status
ps
process status
ps -aux will give all process grep python
ps -aux | grep python
You could also setup a "watch" in a separate window to constantly monitor Python processes as you run a script: watch -n 1 "ps u -C python3". Particularly useful when developing with multiprocessing.
watch -n 1 "ps u -C python3"