# file process_pe.py 
from concurrent.futures import ALL_COMPLETED, ProcessPoolExecutor, wait
 
from utils import calculate
from manager import get_value
 
 
def main():
    print(get_value())
    print(get_value)
    print('-' * 20)
 
    futures = set()
 
    with ProcessPoolExecutor(max_workers=2) as pool:
        for value in [2, 3]:
            futures.add(pool.submit(calculate, value))
 
            done, futures = wait(futures, return_when=ALL_COMPLETED)
 
            for future in done:
                print(future.result())
 
 
if __name__ == '__main__':
    main()

 # file utils.py
 
import time
from manager import get_value, _test_value
 
 
def calculate(x):
    print('<---')
    get_value()
    print(get_value)
    print('test_value: ', _test_value)
    print(f'id of _test_value: {id(_test_value)}')
    print('--->')
    time.sleep(1)
    return x**x

 # file manager.py
 
_test_value = None
 
 
def get_value():
    global _test_value
    print("Global value:", _test_value)
 
    print('.' * 20)
    print(f'id of _test_value: {id(_test_value)}')
    if not _test_value:
        _test_value = 5
    print('.' * 20)
    return _test_value

  
 global _test_value
 print("Global value:", _test_value)