How to check if a process is running?

Question

Python

I want to check when the game really started, otherwise when it hangs in the background, it doesn’t work ...
So it displays when it first started in the background ...

def checking_process(process_name):
    for lsv in range(5000):
        for proc in psutil.process_iter():
            name = proc.name()
            # print(name)
            if name == process_name:
                # pass
                return "good"
            else:
                print("not")