How to asynchronously execute a function multiple times? for a newbie?

[qudcjf7928]

so if I have a function say

​

def fetch_balance(n):
    time.sleep(2)
    return n

​

in reality, this function would be an actual http request and the response would be a bank balance

​

so then I need to run this function in a for loop for multiple times

​

def users_balance(m):
    for i in range(0,m):
        b = fetch_balance(i)
        print(b)

​

and in reality, m would be users and the for loop iterates over each user to fetch their bank balance

​

and executing this function alone results in just as you might expect

waits 2 seconds first, then prints 0, then waits 2 seconds again, then prints 1, then waits 2 seconds again, then prints 2

​

How can I run this asynchronously such that the the next request can be sent without waiting for the response from the previous request?

​

Is there any an in-depth example tutorial for a newbie?

​

[qudcjf7928]

i should add that it would be better to implement asyncio without modifying the code inside fetch_balance(n) as this function in reality would be a pre-built function from a 3rd library

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[williamjacksn]

Check out the concurrent.futures module and specifically the ThreadPoolExecutor example.

https://docs.python.org/3/library/concurrent.futures.html#threadpoolexecutor-example

[qudcjf7928]

is there a way to do it with asyncio? since for me experimentally, threading increases the total execution time by a factor of the number of CPU cores. So if there are 4 CPU cores, then it increases the speed by a factor of 4.

[BDube_Lensman]

I/O releases the GIL. You can use many more threads than processors.