线程间的交互：事件Event

　线程间的交互：

事件event：用于线程间的交互，如：A线程要等待B线程运行完之后再运行，就可以在B线程中e.set,A线程中设置e.wait

方法：

event.isSet():返回event状态值False或True

event.wait()如果event状态为False，将阻塞线程

event.set()默认设定event为True

event.clear（）恢复event的状态为False

from threading import Thread,Event
import os,time
e = Event()

def light():
    time.sleep(5)
    print('light is fun')
    e.set()

def car():
    print('<%s> the car is waiting '%os.getpid())
    e.wait()
    print('<%s> the car is running'%os.getpid())

if __name__ == '__main__':
    for i in range(10):
        t = Thread(target=car)
        t.start()
    t2 = Thread(target=light)
    t2.start()

定时器timer

from threading import Timer
 
 
def hello():
    print("hello, world")
 
t = Timer(1, hello)
t.start()  # after 1 seconds, "hello, world" will be printed

队列Queue

class queue.PriorityQueue(maxsize=0) #存储数据时可设置优先级的队列

class queue.LifoQueue(maxsize=0) #last in fisrt out 

 

class queue.Queue(maxsize=0) #先进先出