On Linux, at least, /dev/random uses entropy information from hardware devices to produce "almost" truly random sequences.

https://en.wikipedia.org/wiki//dev/random

If you've already loaded the web page, you can use something like Firebug to show all of the source pages and scripts, and search those. If you want to search the internet for pages that have specific source, I don't know of a way.

Thanks for the guide. I've always been disappointed with Python's built-in debugging and profiling tools, even as the popularity of the language has increased. The built-in profiler still doesn't have good threading support, and built-in memory inspection tools are essentially nonexistent.

The maintainers of Python should take a look at jmap and jhat from the Java world for examples of informative and usable analysis utilities provided by the language.