Thank you all for your replies. The only thing is I do not understand how the code is working. The following are more particular questions.
Travis: Iam sorry, but I do not know what list comprehension is. Roberto: I do not understand the first half of the last line of your code. Also thank you for also teaching me to use '+' to append one list to another. This will be very useful for me. Christoph: I do not undertand the map method. Thanks again for all the help. :) -- http://mail.python.org/mailman/listinfo/python-list
