Python多线程的几种实现方式

Python threading模块中Thread类常用的三种创建线程方法

• 创建Thread的实例，传递给它一个函数
• 创建Thread的实例，传递给它一个可调用的类实例
• 派生Thread的子类，并创建子类的实例

创建Thread的实例，传递给它一个函数

import threading
from time import ctime, sleep

loops = [4, 6]


def loop(nloop, nsec):
    print('start loop', nloop, 'at:', ctime())
    sleep(nsec)
    print('loop', nloop, 'done at:', ctime())

    
def main():
    print('starting at:', ctime())
    threads = []
    nloops = range(len(loops))

    for i in nloops:
        t = threading.Thread(target=loop, args=(i, loops[i]))
        threads.append(t)

    for i in nloops:
        threads[i].start()

    for i in nloops:
        threads[i].join()

    print('all done at:', ctime())

    
if __name__ == '__main__':
    main()

创建Thread的实例，传递给它一个可调用的类实例

import threading
from time import ctime, sleep

loops = [4, 2]


class ThreadFunc(object):
    def __init__(self, func, args, name=''):
        self.name = name
        self.func = func
        self.args = args

    def __call__(self, *args, **kwargs):
        self.func(*self.args)


def loop(nloop, nsec):
    print('start loop', nloop, 'at:', ctime())
    sleep(nsec)
    print('loop', nloop, 'done at:', ctime())


def main():
    print('starting at:', ctime())
    threads = []
    nloops = range(len(loops))

    for i in nloops:
        t = threading.Thread(target=ThreadFunc(loop, (i, loops[i]), loop.__name__))
        threads.append(t)

    for i in nloops:
        threads[i].start()

    for i in nloops:
        threads[i].join()

    print('all done at:', ctime())


if __name__ == '__main__':
    main()

派生Thread的子类，并创建子类的实例

import threading
from time import ctime,sleep

loops = [4, 2]


class MyThread(threading.Thread):
    def __init__(self, func, args, name=''):
        super().__init__()
        self.name = name
        self.func = func
        self.args = args

    def run(self):
        self.func(*self.args)


def loop(nloop, nsec):
    print('start loop', nloop, 'at:', ctime())
    sleep(nsec)
    print('loop', nloop, 'done at:', ctime())


def main():
    print('starting at:', ctime())
    threads = []
    nloops = range(len(loops))

    for i in nloops:
        t = MyThread(loop, (i, loops[i]), loop.__name__)
        threads.append(t)

    for i in nloops:
        threads[i].start()

    for i in nloops:
        threads[i].join()

    print('all done at:', ctime())


if __name__ == '__main__':
    main()