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Recipe 510387 revision 2 

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()

Diff to Previous Revision

--- revision 1 2007-03-20 18:16:20
+++ revision 2 2012-07-04 01:05:12
@@ -16,8 +16,7 @@
         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(os.path.basename(sys.argv[0]))
-        sys.stdout.write(' HH:MM')
+        sys.stdout.write('Usage: %s HH:MM' % os.path.basename(sys.argv[0]))
 
 def alarm(seconds):
     time.sleep(seconds)

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