Here's a nice introduction/exercise which is part of a python tutorial. http://www.greenteapress.com/thinkpython/html/thinkpython014.html http://www.greenteapr

Here's a nice introduction/exercise which is part of a python tutorial. http://www.greenteapress.com/thinkpython/html/thinkpython014.html http://www.greenteapress.com/thinkpython/html/thinkpython014...