asyncdemo.py

import asyncio

async def foo():
    await asyncio.sleep(1)
    return 2

async def bar():
    f1 = await foo()
    f2 = await foo()
    return f1, f2

async def foobar():
    fb = await asyncio.gather(*(asyncio.ensure_future(f) for f in (foo(), foo())))  # or asyncio.create_task Py 3.7+
    return fb

if __name__ == '__main__':
    import time

    for coro in (foo, bar, foobar):
        start = time.monotonic()
        res = asyncio.run(coro())
        end = time.monotonic()
        print(f'{coro.__name__}:\t{end - start}')

    # foo:    1.0040620969999998
    # bar:    2.0099625779999997
    # foobar: 1.0030931179999998