[FIXED] Python - Asyncio - pass list of argument to function defined with *

Issue

Let's consider the following example from the documentation:

import asyncio

async def factorial(name, number):
    f = 1
    for i in range(2, number+1):
        print("Task %s: Compute factorial(%s)..." % (name, i))
        await asyncio.sleep(1)
        f *= i
    print("Task %s: factorial(%s) = %s" % (name, number, f))

loop = asyncio.get_event_loop()
loop.run_until_complete(asyncio.gather(
    factorial("A", 2),
    factorial("B", 3),
    factorial("C", 4),
))
loop.close()

The gather function is presented as such in the module:

asyncio.gather(*coros_or_futures, loop=None, return_exceptions=False)

It works all fine, but for my real life problem I need to pass in the gather function not a multiplicity of functions with hardcoded arguments, but rather a tuple comprehension of some form creating the multiple functions.

I tried:

loop = asyncio.get_event_loop()
loop.run_until_complete(asyncio.gather(
    [factorial(str(g),g) for g in range(3)]
))
loop.close()

but it doesnt work. Anyone knows how to have that gather function to work with a programatically created list of functions?

TO BE CLEAR: the gather function is not defined by me so i cannot remove the * from its definition and simply pass the list of arguments like that. I would need to "unpack" the list but i don't know how.

Solution

Found the solution:

loop.run_until_complete(asyncio.gather(*(factorial(str(g),g) for g in range(3)))

Answered By - jim basquiat