Start async task in class?

Question

I have the following code:

import asyncio

class Test:

    async def hello_world(self):
            while True:
                print("Hello World!")
                await asyncio.sleep(1)

test = Test()

loop = asyncio.get_event_loop()
# Blocking call which returns when the hello_world() coroutine is done
loop.run_until_complete(test.hello_world())
loop.close()

Is there a way to have the hello_world function starting to run from within the class (when an object of the class is created) without doing it from the outside?

Answer 1

Is the asynchronous constructor trick what you need? To be able to achieve such usage:

async def main():
    test = await Test()

You just need to make the asynchronous constructor return self and add an __await__ method to your class:

class Test:

    async def hello_world(self):
        while True:
            print("Hello World!")
            await asyncio.sleep(1)
        return self

    def __await__(self):
        return self.hello_world().__await__()