self asyncio

import asyncio
from threading import Thread
import time

print('main start:',time.time())

async def download(i):
    print(i, time.time())
    await asyncio.sleep(i)
    b=linkextractor(i)
    if b is not None:
        await asyncio.wait(b)
    else:
        print('all complete',time.time())
        return True

def linkextractor(content):
    if content<3:
        tasks=[]
        tasks.append(download(content+1))
        tasks.append(download(content+1))
        tasks.append(download(content+1))
        return tasks
    print('end linkextractor', time.time())

def start_loop(loop):
    asyncio.set_event_loop(loop)
    loop.run_forever()

new_loop=asyncio.new_event_loop()
t=Thread(target=start_loop,args=(new_loop,))
t.start()

asyncio.run_coroutine_threadsafe(download(1),new_loop)