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Showing content from https://github.com/python/cpython/issues/132898 below:

module `__mp_main__` has no attribute `is_prime` in `ProcessPoolExecutor` example · Issue #132898 · python/cpython · GitHub

python version:3.12.9
An error occurred when running as a standalone script.
An error message is reported when running the sample code of the python document:

Traceback (most recent call last):
File "C:\Users\wen\Desktop\test.py", line 32, in
main()
File "C:\Users\wen\Desktop\test.py", line 28, in main
for number, prime in zip(PRIMES, executor.map(is_prime, PRIMES)):
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Miniconda3\Lib\concurrent\futures\process.py", line 636, in _chain_from_iterable_of_lists
for element in iterable:
^^^^^^^^
File "C:\Miniconda3\Lib\concurrent\futures_base.py", line 619, in result_iterator
yield _result_or_cancel(fs.pop())
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Miniconda3\Lib\concurrent\futures_base.py", line 317, in _result_or_cancel
return fut.result(timeout)
^^^^^^^^^^^^^^^^^^^
File "C:\Miniconda3\Lib\concurrent\futures_base.py", line 456, in result
return self.__get_result()
^^^^^^^^^^^^^^^^^^^
File "C:\Miniconda3\Lib\concurrent\futures_base.py", line 401, in __get_result
raise self._exception
concurrent.futures.process.BrokenProcessPool: A process in the process pool was terminated abruptly while the future was running or pending.

import concurrent.futures
import math

PRIMES = [
    112272535095293,
    112582705942171,
    112272535095293,
    115280095190773,
    115797848077099,
    1099726899285419]

def is_prime(n):
    if n < 2:
        return False
    if n == 2:
        return True
    if n % 2 == 0:
        return False

    sqrt_n = int(math.floor(math.sqrt(n)))
    for i in range(3, sqrt_n + 1, 2):
        if n % i == 0:
            return False
    return True

def main():
    with concurrent.futures.ProcessPoolExecutor() as executor:
        for number, prime in zip(PRIMES, executor.map(is_prime, PRIMES)):
            print('%d is prime: %s' % (number, prime))

if __name__ == '__main__':
    main()

3.12

Windows 10

• gh-132898: Add a note in multiprocessing.Process docs about creating a process in a REPL session #137118
• [3.14] gh-132898: Add a note in multiprocessing.Process docs about creating a process in a REPL (GH-137118) #137154
• [3.13] gh-132898: Add a note in multiprocessing.Process docs about creating a process in a REPL (GH-137118) #137155

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