import asyncio

loop = asyncio.get_event_loop()


class Some:

    def __init__(self):
        self.cache = []
        self.i = 0

    async def chota_run(self):
        while True:
            await asyncio.sleep(1)
            self.i += 1
            print('add to cache {}'.format(self.i))
            self.cache.append(self.i)
            print('cache: {}'.format(self.cache))

    async def clear_cache(self):
        while True:
            await asyncio.sleep(5)
            print('!!! clear cache !!!')
            self.cache = []

if __name__ == '__main__':
    some = Some()
    loop.create_task(some.chota_run())
    loop.create_task(some.clear_cache())
    loop.run_forever()