Python进程multiprocessing.Process()的使用解读

import multiprocessing
import time

def work1():
    for i in range(10):
        print("work1----", i)
        time.sleep(0.5)

if __name__ == '__main__':
    # 创建进程
    # 1. 导入 multiprocessing 模块
    # 2. multiprocessing.Process() 创建子进程
    # 3. start() 方法启动进程

    p1 = multiprocessing.Process(group=None, target=work1)
    p1.start()

    for i in range(10):
        print("这是主进程", i)
        time.sleep(0.5)

import multiprocessing
import time
import os

def work():
    # 获取进程的名称
    print(multiprocessing.current_process())
    # 获取进程的pid
    print(multiprocessing.current_process().pid, os.getpid())

    i = 0
    while i < 10:
        print("work中执行", i)
        time.sleep(0.5)
        i = i + 1

if __name__ == '__main__':
    # 获取进程的pid
    print(multiprocessing.current_process())
    # 创建子进程
    process1 = multiprocessing.Process(group=None, target=work)
    process1.start()

    i = 0
    while i < 10:
        print("我在主线程中执行",i)
        time.sleep(0.3)
        i = i + 1

import multiprocessing
# 定义全局变量
num = 100

# 定义work方法，设置num1的值
def work():
    global num       # 在函数内部声明使用全局变量num
    num = num + 1    # 对num值进行+1
    print("work num = %d" % num)

# 定义work2方法，获取num1的值
def work2():
    print("work2 num = %d" % num)

if __name__ == '__main__':
    # 创建子进程
    process1 = multiprocessing.Process(group=None, target=work, name="MyProcess")
    process1.start()

    # 创建第二个子进程
    process2 = multiprocessing.Process(group=None, target=work2, name="MyProcess2")
    process2.start()

import multiprocessing
import time

def sub_process():
    for i in range(10):
        print("子进程运行中", i)
        time.sleep(0.5)

if __name__ == '__main__':
    # 创建子进程
    p1 = multiprocessing.Process(group=None, target=sub_process, name="p1")
    # 设置守护主进程
    # 第一种方式:
    # p1.daemon = True
    # 第二种方式(最好在退出exit()前一句使用):
    # p1.terminate()
    # 启动
    p1.start()

    time.sleep(2)
    print("OVER!")
    p1.terminate()
    exit()