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Command Line Windows Alarm Clock (Python recipe) by Stephen Chappell
ActiveState Code (http://code.activestate.com/recipes/578362/)

Using primitive but simple calculations, the alarm program below will find the offset to the time specified, sleep, and awake to run an alarm until terminated. This Windows recipe utilizes the msvcrt and winsound modules to operate and has limited use elsewhere.

Python, 30 lines
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try:
    import os
    import sys
    import time
    import msvcrt
    import winsound
except ImportError, error:
    sys.stdout.write('ImportError: %s' % error)
    sys.exit(1)

def main():
    try:
        arg = time.strptime(sys.argv[1], '%H:%M')
        arg_sec = (arg.tm_hour * 60 + arg.tm_min) * 60
        now = time.localtime()
        now_sec = (now.tm_hour * 60 + now.tm_min) * 60 + now.tm_sec
        alarm(arg_sec - now_sec + (86400 if arg_sec <= now_sec else 0))
    except:
        sys.stdout.write('Usage: %s HH:MM' % os.path.basename(sys.argv[0]))

def alarm(seconds):
    time.sleep(seconds)
    while msvcrt.kbhit():
        msvcrt.getch()
    while not msvcrt.kbhit():
        winsound.Beep(440, 250)
        time.sleep(0.25)

if __name__ == '__main__':
    main()
Tags: alarm, clock, demonstration, windows