【代码学习】PYTHON 线程

#coding=utf-8
import threading
import time
def test():
    print("----TEST By SQYY----")
    time.sleep(1)
if __name__ == "__main__":
    for i in range(5):
            t = threading.Thread(target=test)
            t.start() #启动线程，即让线程开始执行

----TEST By SQYY--------TEST By SQYY--------TEST By SQYY----
----TEST By SQYY--------TEST By SQYY----

#coding=utf-8
import threading
import time
class MyThread(threading.Thread):
        def run(self)
        for i in range(3):
                time.sleep(1)
                msg = "I‘m" + self.name + ‘@‘ + str(i) #name属性中保存的是当前线程的名字
                print(msg)
if __name__ ==‘__main__‘:
        t = MyThread()
        t.start()

I‘m Thread-1 @0
I‘m Thread-1 @1
I‘m Thread-1 @2

#coding=utf-8
import threading
import time

class MyThread(threading.Thread):
    def run(self):
        for i in range(3):
            time.sleep(1)
            msg = "I‘m "+self.name+‘ @ ‘+str(i)
            print(msg)
def test():
    for i in range(5):
        t = MyThread()
        t.start()
if __name__ == ‘__main__‘:
    test()

    I‘m Thread-1 @ 0
    I‘m Thread-2 @ 0
    I‘m Thread-5 @ 0
    I‘m Thread-3 @ 0
    I‘m Thread-4 @ 0
    I‘m Thread-3 @ 1
    I‘m Thread-4 @ 1
    I‘m Thread-5 @ 1
    I‘m Thread-1 @ 1
    I‘m Thread-2 @ 1
    I‘m Thread-4 @ 2
    I‘m Thread-5 @ 2
    I‘m Thread-2 @ 2
    I‘m Thread-1 @ 2
    I‘m Thread-3 @ 2

from threading import Thread
import time

#线程之间共享全局变量
g_num = 100

def work1():
    global g_num
    for i in range(3):
        g_num += 1

    print("----in work1, g_num is %d---"%g_num)


def work2():
    global g_num
    print("----in work2, g_num is %d---"%g_num)


print("---线程创建之前g_num is %d---"%g_num)

t1 = Thread(target=work1)
t1.start()

#延时一会，保证t1线程中的事情做完
time.sleep(1)

t2 = Thread(target=work2)
t2.start()

---线程创建之前g_num is 100---
----in work1, g_num is 103---
----in work2, g_num is 103---