Getting values from functions that run as asyncio tasks

Question

I was trying the following code:

import asyncio  @asyncio.coroutine def func_normal():         print("A")         yield from asyncio.sleep(5)         print("B")         return 'saad'  @asyncio.coroutine def func_infinite():     i = 0     while i<10:         print("--"+str(i))         i = i+1     return('saad2')  loop = asyncio.get_event_loop()  tasks = [     asyncio.async(func_normal()),     asyncio.async(func_infinite())]  loop.run_until_complete(asyncio.wait(tasks)) loop.close() 

I can't figure out how to get values in variables from these functions. I can't do this:

asyncio.async(a = func_infinite()) 

as this would make this a keyword argument. How do I go about accomplishing this?

Answer 1

The coroutines work as is. Just use the returned value from loop.run_until_complete() and call asyncio.gather() to collect multiple results:

#!/usr/bin/env python3 import asyncio  @asyncio.coroutine def func_normal():     print('A')     yield from asyncio.sleep(5)     print('B')     return 'saad'  @asyncio.coroutine def func_infinite():     for i in range(10):         print("--%d" % i)     return 'saad2'  loop = asyncio.get_event_loop() tasks = func_normal(), func_infinite() a, b = loop.run_until_complete(asyncio.gather(*tasks)) print("func_normal()={a}, func_infinite()={b}".format(**vars())) loop.close() 

Output

--0 --1 --2 --3 --4 --5 --6 --7 --8 --9 A B func_normal()=saad, func_infinite()=saad2