【Python】信号量 event定时器

# if __name__ == '__main__':
#     for i in range(10):
#         t = Thread(target=task)
#         t.start()


# Event事件
# from threading import Thread,Event
# import time
# event = Event()
# # event.wait()  等开锁
# # event.set()   开锁
# # event.is_set()  判断是否被开锁
# # even.clear()  恢复even的set状态为Flase
#
# def student(name):
#     print('学生 %s 正在听课' % name)
#     event.wait(2)  # 参数代表超时自动set()时间
#     # event.wait()
#     print('学生 %s 正在课间活动' % name)
#
# def teacher(name):
#     print('老师 %s 正在授课' % name)
#     time.sleep(7)
#     event.set()
#
#
# if __name__ == '__main__':
#     stu1 = Thread(target=student, kwargs={'name': 'alex1'})
#     stu2 = Thread(target=student, kwargs={'name': 'alex2'})
#     stu3 = Thread(target=student, kwargs={'name': 'alex3'})
#
#     stu1.start()
#     stu2.start()
#     stu3.start()
#     tea = Thread(target=teacher, kwargs={'name': 'egon'})
#     tea.start()

# =============定时器================
#  本质上还是一个线程
# from threading import  Timer
# def task(name):
#     print('hello %s' % name)
# t = Timer(5, task, kwargs={'name':'caya'})
# t.start()


# 定时生成验证码
from threading import Timer
import random

class Code:
    def __init__(self):
        self.make_cache()

    def make_cache(self, interval=5):
        self.cache=self.make_code()
        print(self.cache)
        self.t = Timer(interval, self.make_cache)
        self.t.start()

    def make_code(self, n=4):
        res = ''
        for i in range(n):
            s1 = str(random.randint(0, 9))
            s2 = chr(random.randint(65, 90))
            res += random.choice([s1, s2])
        return res

    def check(self):
        while 1:
            code = input('请输入验证码>>').strip()
            if code.upper() == self.cache:
                print('正确')
                self.t.cancel()
                break


obj = Code()
obj.check()