stop_watch.py

#! python3
# stop_watch.py - A simple stopwatch program.

import time

# Display the program's instructions.
print('Press ENTER to begin. \nAfterwards, press ENTER to "click" the stopwatch.\nPress Ctrl+C to quite.')
input() # press ENTER to begin
print('Started.')
start_time = time.time()    # get the first lap's start time
last_time = start_time
lap_num = 1

# Start tracking the lap times.
try:
    while True:
        input()
        lap_time = round(time.time() - last_time, 2)
        total_time = round(time.time() - start_time, 2)
        print('Lap #%s: %s (%s)' % (lap_num, total_time, lap_time), end = '')
        lap_num += 1
        last_time = time.time() # reset the last lap time
except KeyboardInterrupt:
    # Handle the Ctrl+C exception to keep its error message from displaying.
    print('\nDone!')