How to give different names to ThreadPoolExecutor threads in Python

Question

I have the below code for creating threads and running them.

from concurrent.futures import ThreadPoolExecutor
import threading


def task(n):
    result = 0         


        

Answer 1

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 ThreadPoolExecutor
import threading
import time

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

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

from concurrent.futures import ThreadPoolExecutor
import threading
import time

def 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: 45 ThreadPoolExecutor-0_1 with variable 100: 4950

Answer 2

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.