asyncio tutorial

main.py

"""
$ python3 main.py 
Compute 1 + 10 ...
Compute 10 - 1 ...
10 - 1 = 9
1 + 10 = 11
"""
import asyncio


async def compute(x, y, f, desc, t_sec):
    print(desc % (x, y))
    await asyncio.sleep(t_sec)
    return f(x, y)


async def print_sum(x, y):
    result = await compute(x, y, lambda x, y: x + y, "Compute %s + %s ...", 1.0)
    print("%s + %s = %s" % (x, y, result))


async def print_sub(x, y):
    result = await compute(x, y, lambda x, y: x - y, "Compute %s - %s ...", 0.4)
    print("%s - %s = %s" % (x, y, result))


async def main(loop):
    sum_task = loop.create_task(print_sum(1, 10))
    sub_task = loop.create_task(print_sub(10, 1))

    await sub_task
    await sum_task

loop = asyncio.get_event_loop()
loop.run_until_complete(main(loop))
loop.close()