"Before I get into the next program, I should mention the Python
home page, which offers recent versions of the interpreter and a
lot of helpful information about the language. In particular, this
tutorial is excellent. Still, I highly recommend getting a hold of
Learning Python by Mark Lutz and David Ascher (O'Reilly 1999),
which explains things way more thoroughly than the on-line
tutorial. You also may have the tutorial and other Python
documentation on your GNU/Linux box..."