并发运行python子进程似乎不是并发的

我的任务是更新当前作为单个进程运行的现有python程序,以运行子进程 同时 。我对python并发技术不熟悉,并编写了一个简单的脚本来了解如何使用 multiprocessing 图书馆:

import datetime
import logging
import multiprocessing as mp
import time
from multiprocessing import Process


def child_operation():
    """Run a child process."""
    name = 'child'
    period = 1
    logging.info(f"{datetime.datetime.now()}: started operation {name}")
    for i in range(10):
        logging.info(f"operation {name}, {i=}: sleeping for period {period} sec")
        time.sleep(period)
    logging.info(f"{datetime.datetime.now()}: ended operation {name}")


def main():
    logging.basicConfig(format='%(asctime)s %(message)s', level=logging.DEBUG)
    mp.set_start_method('spawn')

    main_sleep_period: int = 5

    # Spawn a process
    process = Process(target=child_operation())
    process.start()

    # Now do something in main while process is running
    logging.info(f'main: sleeping for {main_sleep_period} sec')  # XX
    time.sleep(main_sleep_period)
    logging.info('main stopped sleeping')

    process.join()


if __name__ == "__main__":
    main()

因此,子进程运行约10秒。我原本预计“main”进程中标记为“XX”的行会在子进程启动后不久运行。然而,我总是发现这条线出现 之后 子进程完成其操作:

2024-08-23 13:32:56,946 2024-08-23 13:32:56.946205: started operation child
2024-08-23 13:32:56,946 operation child, i=0: sleeping for period 1 sec
2024-08-23 13:32:57,946 operation child, i=1: sleeping for period 1 sec
2024-08-23 13:32:58,947 operation child, i=2: sleeping for period 1 sec
2024-08-23 13:32:59,948 operation child, i=3: sleeping for period 1 sec
2024-08-23 13:33:00,949 operation child, i=4: sleeping for period 1 sec
2024-08-23 13:33:01,950 operation child, i=5: sleeping for period 1 sec
2024-08-23 13:33:02,951 operation child, i=6: sleeping for period 1 sec
2024-08-23 13:33:03,952 operation child, i=7: sleeping for period 1 sec
2024-08-23 13:33:04,953 operation child, i=8: sleeping for period 1 sec
2024-08-23 13:33:05,953 operation child, i=9: sleeping for period 1 sec
2024-08-23 13:33:06,954 2024-08-23 13:33:06.954231: ended operation child
2024-08-23 13:33:06,976 main: sleeping for 5 sec
2024-08-23 13:33:11,978 main stopped sleeping

我想我在做傻事。我试着在谷歌上搜索例子,但我看到的例子只显示了多个子进程是如何并发运行的,而不是我们有一个主进程和一个子进程以及它们是如何相互作用的。

有人能指出我的错误吗?