# alarm_clock.py # Description: A simple Python program to make the computer act # like an alarm clock. Start it running from the command line # with a command line argument specifying the duration in minutes # after which to sound the alarm. It will sleep for that long, # and then beep a few times. Use a duration of 0 to test the # alarm immediiately, e.g. for checking that the volume is okay. # Author: Vasudev Ram - http://www.dancingbison.com import sysimport stringfrom time import sleep sa = sys.argvlsa = len(sys.argv)if lsa != 2:  print "Usage: [ python ] alarm_clock.py duration_in_minutes"  print "Example: [ python ] alarm_clock.py 10"  print "Use a value of 0 minutes for testing the alarm immediately."  print "Beeps a few times after the duration is over."  print "Press Ctrl-C to terminate the alarm clock early."  sys.exit(1) try:  minutes = int(sa[1])except ValueError:  print "Invalid numeric value (%s) for minutes" % sa[1]  print "Should be an integer >= 0"  sys.exit(1) if minutes < 0:  print "Invalid value for minutes, should be >= 0"  sys.exit(1) seconds = minutes * 60 if minutes == 1:  unit_word = " minute"else:  unit_word = " minutes" try:  if minutes > 0:    print "Sleeping for " + str(minutes) + unit_word    sleep(seconds)  print "Wake up"  for i in range(5):    print chr(7),    sleep(1)except KeyboardInterrupt:  print "Interrupted by user"  sys.exit(1) # EOF