threading.Event类内置了两个成员：
self._cond = Condition(Lock()) 这是一个条件同步线程，用于wait和noticeall
self._flag = False 这个值，默认是False，如果是False，线程进行到wait函数是会阻塞，如果是True，有wait函数的线程解除阻塞，并且在运行到wait函数时如果还是True，这个时候不会阻塞，所以一般在wait后的代码执行完成后，应紧跟event.clear()
threading.Event有4种方法：
Event.wait()
Event.set()
Event.clear()
Event.isSet()
set函数将self._flag值设置为True ，clear函数将self._flag值设置为False，isSet判断self._flag值是True还是False
import time import threading import sys event = threading.Event() action = ‘parse‘ class Plane(threading.Thread): def __init__(self, name, x, y): threading.Thread.__init__(self, name=name, args=(x, y)) self.pix = [x, y] def run(self): global action while action != ‘stop‘: event.wait() eval(‘.‘.join([‘self‘, action])+‘()‘) sys.stdout.write(f‘{self.name}:{self.pix}\n‘) event.clear() def left(self): self.pix[0] -= 1 def right(self): self.pix[0] += 1 def up(self): self.pix[1] -= 1 def down(self): self.pix[1] += 1 if __name__ == ‘__main__‘: threads = [] for i in range(1, 6): threads.append(Plane(‘Plane‘ + str(i), 100, 100)) for t in threads: t.setDaemon(True) # 设置子线程为守护，即主线程结束则跟着结束 t.start() ipt = ‘ok‘ print(ipt) while ipt != ‘exit‘: ipt = input(‘请输入方向：‘) action = ipt.strip() if action in [‘stop‘, ‘left‘, ‘right‘, ‘up‘, ‘down‘]: event.set() time.sleep(0.2) else: # action = ‘stop‘ # event.set() print("完毕")
原文：https://www.cnblogs.com/bohua320/p/15313453.html