用一个装饰器，监控程序的运行时间

import time

def count_time(func):
    def int_time(*args, **kwargs):
        start_time = time.time()  # 程序开始时间
        func()
        over_time = time.time()   # 程序结束时间
        total_time = over_time - start_time
        print('程序共计%s秒' % total_time)

    return int_time

@count_time
def main():
    print('>>>>开始计算函数运行时间')
    x = 0
    for i in range(1000000):
        x=x//13
    print(x)

if __name__ == '__main__':
    main()