Python学习笔记24：多进程

#多进程
——进程间通讯（IPC：InterProcessCommunication）
——进程之间无任何共享状态

import multiprocessing
from time import sleep, ctime
class ClockProcess(multiprocessing.Process):
    def __init__(self, interval):
        super().__init__()
        self.interval = interval

    def run(self):
        while True:
            print('The time is %s'%ctime())
            sleep(self, interval)

if __name__ == '__main__':
    p = ClockProcess(3)
    p.start()
    while True:
        print('sleeping......')
        sleep(1)

sleeping......
Process ClockProcess-1:
Traceback (most recent call last):
File "C:UsersBruceAppDataLocalProgramsPythonPython37libmultiprocessingprocess.py", line 297, in _bootstrap
self.run()
File "C:迅雷下载demo.py", line 81, in run
sleep(self, interval)
NameError: name 'interval' is not defined
The time is Mon Dec 24 23:38:25 2018
sleeping......
sleeping......
sleeping......
sleeping......
sleeping......
sleeping......
sleeping......
sleeping......
sleeping......
sleeping......
sleeping......
sleeping......
sleeping......
sleeping......
sleeping......
sleeping......
sleeping......

Process finished with exit code -1

from multiprocessing import Process
import os
def info(title):
    print(title)
    print('module name:', __name__)
    #得到父进程的id
    print('parent process:', os.getppid())
    #得到本身进程的id
    print('process id:', os.getpid())

def f(name):
    info('function f')
    print('hello', name)

if __name__ == '__main__':
    info('main line')
    p = Process(target = f, args = ('bob',))
    p.start()
    p.join()

main line
module name: __main__
parent process: 94984
process id: 103092
function f
module name: __mp_main__
parent process: 103092
process id: 21428
hello bob

Process finished with exit code 0