event紅綠燈例項
import threading,time
event=threading.Event() #生成一個event物件
def lighter():
count=0
event.set()#開始設定標誌位 綠燈 設定了標誌位程式就通行
while True:
if count>5 and count<10:#改成紅燈 6~9為紅燈
print("\033[41;1mred light is on ...\033[0m")
elif count>10:
event.set()#變綠燈 設定標誌位
else:
print("\033[42;1mgreen light is on ...\033[0m") #0~5位綠燈
time.sleep(1) #每隔一秒記一次
def car(name):
while True:
if event.is_set(): #is_set 判斷是否設定標誌位 設定了標誌位為綠燈 通行
print("[%s] running..."%name)
time.sleep(1)
else:
print("[%s] sees red light,waiting..."%name)
event.wait() #wait卡住，等待標誌位被設定 等到標誌位設定之後程式再往下走
print("033[34;1m[%s] green light is on,start going...\033[34;0m"%name)
light=threading.Thread(target=lighter,)
light.start()
car1=threading.Thread(target=car,args=("Honda",))
car1.start()