async await 使用例子

[fanhaipeng0403]

import asyncio

async def slow_operation(n):
    await asyncio.sleep(n)
    print('Slow operation {} complete'.format(n))
    return n


loop = asyncio.get_event_loop()
done, _ = loop.run_until_complete(
 asyncio.wait([
        slow_operation(1),
        slow_operation(2),
        slow_operation(9),
        slow_operation(2),
        slow_operation(1),
        slow_operation(2),
        slow_operation(3),
        ]))
for fut in done:
    print("return value is {}".format(fut.result()))

Slow operation 1 complete
Slow operation 1 complete
Slow operation 2 complete
Slow operation 2 complete
Slow operation 2 complete
Slow operation 3 complete
Slow operation 9 complete
return value is 2
return value is 1
return value is 2
return value is 1
return value is 9
return value is 3
return value is 2