[FIXED] Return object to end parallel while True loop

Issue

I am writing a little API to make my python command line output look just a little nicer. But there is still a big problem, because I would like to be able to call a function like display_loading_until_event(text) which should:

1. Immediately return a way to "finish" the loading animation
2. Update the loading animation every 0.25 seconds.

I also tried using Process from the multiprocessing library but it doesn't seem to work:

from time import sleep

def display_loading_until_event(message):
    from multiprocessing import Process
    
    class Stop:
       def __init__(self):
            self.run = True

    class LoadingAnimationProcess(Process):
        def __init__(self, stopper, *args, **kwargs):
            Process.__init__(self, *args, **kwargs)
            self.stop = stopper

        def run(self):
            def get_loading(position):
                return positions[position] # Returns the way the loading animation looks like (position: ["\", "|", "-"])

            print(get_loading(0), end=message) # Simplified version
            pos = 0
            while self.stop.run:
                sleep(0.25)
                pos = pos + 1
                print("\r" + get_loading(pos) + message, end="") # Again, simplified
                if pos == len(positions) - 1:
                    pos = -1
                sleep(0.25)
            print("\r" + "✔" + message) # Prints ✔ to signal that the loading is done

    stopper = Stop()

    loading = LoadingAnimationProcess(stopper)
    loading.start() # Starts the process
    def stop():
        stopper.run = False
        sleep(1)
        # loading.join() ???
    return stop # This therefore returns a function to stop the loading, right?

# So this should in theory work:
positions = ["\\", "|", "-"]
endfnc = display_loading_until_event("Hello loading")
sleep(4)
endfnc()
# And now the loading SHOULD STOP

This code is just an example, the real code is a bit more complex but this should do. The loading animation doesn't work on powershell or so (\r is the thing that breaks it.)

The current code works and all things after the display_loading_until_event call get executed but the loading doesn't stop.

And also I don't think that this is the right way to do this...

Solution

This kind of does the job: How to end a while loop in another Thread?

I just return the "condition.set" method and it works!

Answered By - Qrashi