Python多线程

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• Demo1

import threading
import time

def say():
    time.sleep(2)
    print("我是子线程",time.strftime('%Y-%m-%d %H:%M:%S'))
if __name__ == "__main__":
    for i in range(3):
        t = threading.Thread(target=say)
        t.start()
    print("我是主线程",time.strftime('%Y-%m-%d %H:%M:%S'))

日志：
我是主线程 2018-01-26 16:39:18
我是子线程 2018-01-26 16:39:20
我是子线程 2018-01-26 16:39:20
我是子线程 2018-01-26 16:39:20
Process finished with exit code 0

• Demo2 ：子线程互不干扰 Join()堵塞主线程

import threading
from time import sleep, ctime
def sign():
    for i in range(3):
        print('dosomething1...%d' % i)
        sleep(1)
    print('sign end')

def dance():
    for i in range(3):
        print('dosomething2...%d' % i)
        sleep(1)
    print('dance end')

if __name__ == '__main__':
    print('main thread startTime---:%s' % ctime())

    t1 = threading.Thread(target=sign) 
    # t1 = threading.Thread(target=sign())  
    # 这里加了sign() 就不是分线程了 坑！
    t2 = threading.Thread(target=dance)
    t1.start()
    t2.start()
    #t1.join()
    #t2.join()  这里加上Join之后会堵塞主线程
    print('main thread endTime---:%s' % ctime())

日志：未加上Join
main thread startTime---:Fri Jan 26 16:56:11 2018
dosomething1...0
dosomething2...0
main thread endTime---:Fri Jan 26 16:56:11 2018
dosomething2...1
dosomething1...1
dosomething1...2
dosomething2...2
dance end
sign end

日志：加上Join
main thread startTime---:Fri Jan 26 16:59:53 2018
dosomething1...0
dosomething2...0
dosomething1...1
dosomething2...1
dosomething1...2
dosomething2...2
sign end
dance end
main thread endTime---:Fri Jan 26 16:59:56 2018

• threading 的一些方法

print(threading.current_thread()) # 输出当前线程
count = len(threading.enumerate()) # 输出当前线程总数
print('当前运行线程数：%d' % count)

自定义线程

需要继承threading.Thread，同时重写run方法

class MyThread(threading.Thread):

    def run(self):
        for i in range(3):
            sleep(1)
            message = 'I`m'+self.name +'@'+str(i)
            print(message)
def main():
    for i in range(3):
        t = MyThread()
        t.start()

if __name__ == '__main__':
    main()

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