import threading
import time,randomevent = threading.Event()def lighter():count = 0event.set() #先设置绿灯while True:if count > 5 and count < 10 : #改成红灯event.clear() #把标注位清空print("\033[41;1m red light is on...\033[0m")elif count > 10:event.set() #变绿灯count = 0else:print("\033[42;1m  green  is on...\033[0m")time.sleep(1)count += 1def car(name):while True:time.sleep(random.randrange(10))if event.is_set(): #设置标志位代表绿灯print("[%s] running ..." % name )else:print("[%s] sees red light ， waiting ..." % name )event.wait()print ("\033[34;1m[%s] green light is on ,start going ...\033[0m" % name)light = threading.Thread(target=lighter,)
light.start()
for i in range(3):#假设有4台机器，编号从0 - 3 ，随机抽取car1 = threading.Thread(target=car,args=(i,))car1.start()
输出：green  is on...
[0] running ...green  is on...green  is on...
[0] running ...green  is on...green  is on...green  is on...
[2] running ...red light is on...
[1] sees red light ， waiting ...red light is on...red light is on...
[0] sees red light ， waiting ...red light is on...green  is on...
[1] green light is on ,start going ...
[0] green light is on ,start going ...green  is on...

import threading,time
import random
def light():if not event.isSet():event.set() #设置标志位，wait就不阻塞，为绿灯状态count = 0while True:if count < 5:print('\033[42;1m--green light on---\033[0m')elif count < 8:print('\033[43;1m--yellow light on---\033[0m')elif count <15:if event.isSet():event.clear()print('\033[41;1m--red light on---\033[0m')else:count = 0event.set() #count归零，重新设置标志位，打开绿灯time.sleep(1)count +=1
def car(n):while 1:time.sleep(random.randrange(10))if  event.isSet(): #设置标志位，表示绿灯print("car [%s] is running.." % n)else:print("car [%s] is waiting for the red light.." %n)
if __name__ == '__main__':event = threading.Event()Light = threading.Thread(target=light)Light.start()for i in range(1,5):t = threading.Thread(target=car,args=(i,))t.start()

import threading
def hello():print("hello world")t = threading.Timer(30,hello) #30为等待的时间，按秒计算
t.start()
输出：
hello world