How to get coroutine from a task, and an object from a coroutine?

[AlekseyPython]

Python 3.5

I have an object, one of the methods of which is coroutine:

class A:
    def __init__(self):
        self.number = random.random()

    async def my_method(self):
       asyncio.sleep(1)
       print('Hello, world!')

I create task:

async def add_task(tasks:list):
    a = A()
    coro = a.my_method()
    task = asyncio.create_task(coro)
    tasks.append(task)

How can I get object 'a' from tasks[0]?