python---多任务篇

1.多进程完成多任务

import time
import multiprocessing

def coding():
    """编写代码"""
    for i in range(3):
        print("正在编写代码====")
        time.sleep(1)

def music():
    """听音乐"""
    for i in range(3):
        print("正在听音乐======")
        time.sleep(1)

if __name__ == '__main__':
    # coding()
    # music()
    # 通过进程类创建进程对象
    coding_process = multiprocessing.Process(target=coding)
    music_process = multiprocessing.Process(target=music)
    # 启动子进程
    coding_process.start()
    music_process.start()

2.进程执行带有参数的任务

import time
import multiprocessing

def coding(num):
    """编写代码"""
    for i in range(num):
        print("正在编写代码====")
        time.sleep(1)

def music(num, name):
    """听音乐"""
    print("我是：", name)
    for i in range(num):
        print("正在听音乐======")
        time.sleep(1)

if __name__ == '__main__':
    # 通过进程类创建进程对象
    coding_process = multiprocessing.Process(target=coding, args=(3,))
    music_process = multiprocessing.Process(target=music, kwargs={
   "num": 2, "name": "大帅"})
    # 启动子进程
    coding_process.start()
    music_process.start()

3.进程获取进程编号

import time
import multiprocessing
import os

def coding():
    """编写代码"""
    print("当前写代码的子进程的编号：", os.getpid())
    print("当前写代码的父进程的编号：", os.getppid())
    for i