How to implement countdown function in python

The following example uses the time module to implement the stopwatch function:

import time print('按下回车开始计时，按下 Ctrl + C 停止计时。') while True: try: input() # 如果是 python 2.x 版本请使用 raw_input() starttime = time.time() print('开始') while True: rint('计时: ', round(time.time() - starttime, 0), '秒', end="\r") time.sleep(1) except KeyboardInterrupt: print('结束') endtime = time.time() print('总共的时间为:', round(endtime - starttime, 2),'secs') break

Test results:

按下回车开始计时，按下 Ctrl + C 停止计时。 开始 计时: 3.0 秒 计时: 5.0 秒 ^C结束 6.0 秒 总共的时间为: 6.69 secs

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