python进程笔记

一、创建进程

from builtins import print, range, super
from multiprocessing.context import Process
import time


def f(name):
    time.sleep(1)
    print('hello', name, time.ctime())
if __name__ == '__main__':
    p_list = []
    for i in range(5):
        p = Process(target=f,args=('linda',))
        p_list.append(p)
        p.start()
    for i in p_list:
        i.join()
    print('end')
类方式
class MyProcess(Process):
    def __init__(self,name):
        super(MyProcess, self).__init__()
        self.name = name
    def run(self):
        print('hello',self.name,time.ctime())
list = []
if __name__ == '__main__':
    for i in range(5):
        p = MyProcess('linda')
        p.run()

二、进程的队列（跟之前的队列无关）--》实现进程间的数据共享

def f(q):
    q.put('aa')
    print(id(q))
if __name__ == '__main__':
    q = Queue()
    print(id(q))
    for i in range(3):
        p = Process(target=f,args=(q,))
        p.run()

使用Pipe管道实现多进程通信

def f(conn):
    conn.send('我是子进程')
    conn.close()
if __name__ == '__main__':
    parent_conn,child_conn = Pipe()
    p = Process(target=f,args=(child_conn,))
    p.start()
    print(parent_conn.recv())
    p.join()