How to give different names to ThreadPoolExecutor threads in Python

from the docs:

New in version 3.6: The thread_name_prefix argument was added to allow users to control the threading.Thread names for worker threads created by the pool for easier debugging.

using the thread_name_prefix argument:

concurrent.futures.ThreadPoolExecutor(max_workers=None, thread_name_prefix='')

You say: "both the threads have the same name".
That's not correct! The name is the same because the same thread is used for both tasks: in fact task() exits immediately.
In order to have both threads involved, you have to add some sleep in your task() function.

Just to recap:

(1) without sleep:

from concurrent.futures import ThreadPoolExecutorimport threadingimport timedef task(n):    result = 0    i = 0    for i in range(n): result = result + i    print(f'{threading.current_thread().name} with variable {n}: {result}')    executor = ThreadPoolExecutor(max_workers=3)executor.submit(task, (10))executor.submit(task, (100))    

In this case the output will be:

ThreadPoolExecutor-0_0 with variable 10: 45ThreadPoolExecutor-0_0 with variable 100: 4950

(2) with a sleep inside task(), to make the function longer in time:

from concurrent.futures import ThreadPoolExecutorimport threadingimport timedef task(n):    result = 0    i = 0    for i in range(n): result = result + i    time.sleep(.5)    print(f'{threading.current_thread().name} with variable {n}: {result}')executor = ThreadPoolExecutor(max_workers=3)executor.submit(task, (10))executor.submit(task, (100)) 

In this case the output will be:

ThreadPoolExecutor-0_0 with variable 10: 45ThreadPoolExecutor-0_1 with variable 100: 4950