python 多进程代码问题以及用 pyinstaller 打包成exe 问题解决

python 多进程运行报错concurrent.futures.process.BrokenProcessPool: A process in the process pool was terminated abruptly while the future was running or pending.

#! /usr/bin/env python
# -*- coding: utf-8 -*-#

# -------------------------------------------------------------------------------
# Name:         demo
# Author:       yunhgu
# Date:         2021/6/25 13:41
# Description: 
# -------------------------------------------------------------------------------
from concurrent.futures import ProcessPoolExecutor, as_completed
import time
import multiprocessing
import os


def job(jobid):
    print(f"start job {jobid}   time:{time.time()}  id:{os.getpid()}")
    time.sleep(2)
    print(f"{jobid} finished")
    return "success"


multiprocessing.freeze_support()
with ProcessPoolExecutor(max_workers=4) as p:
    task_list = [p.submit(job, job_id) for job_id in range(5)]
    for task in as_completed(task_list):
        if task.done():
            print(task.result())

需要添加main

#! /usr/bin/env python
# -*- coding: utf-8 -*-#

# -------------------------------------------------------------------------------
# Name:         demo
# Author:       yunhgu
# Date:         2021/6/25 13:41
# Description: 
# -------------------------------------------------------------------------------
from concurrent.futures import ProcessPoolExecutor, as_completed
import time
import multiprocessing
import os


def job(jobid):
    print(f"start job {jobid}   time:{time.time()}  id:{os.getpid()}")
    time.sleep(2)
    print(f"{jobid} finished")
    return "success"

if __name__ == '__main__':
    multiprocessing.freeze_support()
    with ProcessPoolExecutor(max_workers=4) as p:
        task_list = [p.submit(job, job_id) for job_id in range(5)]
        for task in as_completed(task_list):
            if task.done():
                print(task.result())

使用pyinstaller 打包成exe

对于pyinstaller 是不支持含有多进程的python打包，打包完毕后，不会执行子进程的内容，而是会一直创建进程，导致崩溃
解决方法：
multiprocessing.freeze_support()
这句话一定要放在main下的第一行，如下所示

#! /usr/bin/env python
# -*- coding: utf-8 -*-#

# -------------------------------------------------------------------------------
# Name:         demo
# Author:       yunhgu
# Date:         2021/6/25 13:41
# Description: 
# -------------------------------------------------------------------------------
from concurrent.futures import ProcessPoolExecutor, as_completed
import time
import multiprocessing
import os


def job(jobid):
    print(f"start job {jobid}   time:{time.time()}  id:{os.getpid()}")
    time.sleep(2)
    print(f"{jobid} finished")
    return "success"

if __name__ == '__main__':
    multiprocessing.freeze_support()
    with ProcessPoolExecutor(max_workers=4) as p:
        task_list = [p.submit(job, job_id) for job_id in range(5)]
        for task in as_completed(task_list):
            if task.done():
                print(task.result())