Un programa de cronometro

stopwatch.py

#! /usr/bin/python3
# stopwatch.py - Un programa de cronometro

import time
print('Presiona ENTER para iniciar. Despues, presiona ENTER para hacer "clic" \
    al stopwatch. Presiona Ctrl-C para salir')
startTime=time.time()
lastTime = startTime
lapNum = 1
try:
    while True:
        input()
        lapTime = round(time.time() - lastTime, 2)
        totalTime = round(time.time() - startTime, 2)
        print('Lap #%s: %s (%s)' % (lapNum, totalTime, lapTime), end='')
        lapNum +=1
        lastTime = time.time()
except KeyboardInterrupt:
    print("\nHecho.")