import asyncio

async def ex(id, n):

    print(id+" start")

    await asyncio.sleep(n/2)

    print(id+" 1/2")

    await asyncio.sleep(n/2)

    print(id+" 2/2")

    return n + 1

async def go():

    c1 = ex("one", 4)

    c2 = ex("two", 6)

    await asyncio.gather(c1, c2)

g = go()

asyncio.run(g)

one start

two start

one 1/2

two 1/2

one 2/2

two 2/2