using python to visit web sites and print the web sites image to files

[Goldfish]

You can definitely create a web bot with python. It doesn't require
that you "drive" A real web browser. There are libraries to open web
pages, scrape their contents, and do downloading. That would make your
bot platform neutral. Driving a GUI browser has the risk of being a
brittle script that might not handle different browsers, different
platforms, maybe even not handle different versions.

I run a mediawiki web site, and found a handy python-based library
written to manage it called pywikipediabot at http://sourceforge.net/projects/pywikipediabot/.

Okay, this library won't do your leg work for you, but it has pieces
and parts that demonstrate how to use python to surf a web site. Then,
with an HTML parser, you can hunt down images.

Greg