[Tutor] Learning Python with Programming Collective Intelligence

Hello, I discovered this list while doing research about the book Programming Collective Intelligence by Toby Segaran. In the archives, a few of the members wanted to create a group to discuss the code and algorithms further. Those threads were a few years old, and unfortunately I'm just now disco

[Tutor] What's going on in this Python code from Programming Collective Intelligence?

I'm reading the book Programming Collective Intelligence by Toby Segaran. I'm having a lot of difficulty understanding the some of the code from chapter four (the code for this chapter is available online at https://github.com/cataska/programming-collective-intelligence-code/blob/master/chapter4/se