Async sleep in loop

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• 4 sleeping in parallel will be much faster
• This time we used create_task to set up the tasks ahead of time and the we awaited all of them.

examples/async/sleep_loop_async.py

import time
import asyncio

async def sleep(cnt, sec):
    print(f"Start {cnt}")
    await asyncio.sleep(sec)
    print(f"End {cnt}")

async def main():
    co_routines = []
    for i in range(4):
        co_routines.append(sleep(i, 1))

    for t in co_routines:
        await t

start = time.monotonic()
asyncio.run(main())
end = time.monotonic()
print(f"Elapsed {end-start}")

Start 0
Start 1
Start 2
Start 3
End 0
End 1
End 2
End 3
Elapsed 1.0030033588409424