How to end the loop using a method? [duplicate]

Question

How to force to end the while loop using method?

class Test(object):

  def start(self):
    while True:
      self.stop()

  def stop(self):
    return break

obj=Test()
obj.start()

Answer 1

You should keep a flag, and check that in the while loop.

class Test(object):
    def __init__(self):
        self.running = False

    def start(self):
        self.running = True
        while self.running:
            self.running = not self.stop()


    def stop(self):
        return True

obj=Test()
obj.start()

If you want to stop immidiately then you will need to call break:

def start(self):
    self.running = True
    while self.running:
        if self.stop():
            break;
        # do other stuff

Answer 2

The simplest way to achive this would be to raise and except a StopIteration. This will stop the loop immediately as opposed to RvdK's answer which will stop at the next iteration.

class Test(object):

  def start(self):
    try:
      while True:
        self.stop()
    except StopIteration:
      pass

  def stop(self):
    raise StopIteration()

obj = Test()
obj.start()