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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