concurrentのエラー用

main.py

import concurrent
import concurrent.futures


def inner_concurrent(num: int):
    print(f"num = {num}")
    return num * num


def outer_concurrent():
    with concurrent.futures.ThreadPoolExecutor(max_workers=1) as executor:
        futures = [executor.submit(inner_concurrent, i) for i in range(3)]
    return futures


def main():
    with concurrent.futures.ProcessPoolExecutor(max_workers=1) as executor:
        futures = [executor.submit(outer_concurrent) for _ in range(1)]

    for outer_f in futures:
        for inner_f in outer_f.result():
            print(f"result = {inner_f.result()}")


if __name__ == "__main__":
    main()