Python Debugging Notes

So I had a great stackexchange comment that I referred left open in my Chromium tab forever, and I just realized that I lost it somehow.  I've searched my history and everything, it's gone in the many clicks of reddit, barstoolsports, etc.  So this is just going to be my ongoing blog post for debugging notes as I come across them as I need them.  So here goes:

Scipy Lecture on Debugging

Boltons

Starting Debugging on Error Discussion

Python Cookbook Discussion

The comment I lost, was someone explaining their process of navigating the Traceback using the commands:

list
up
down

Sorry, I can't find the comment so that I can cite his help.

This blog is an ongoing note for my own reference, so expect it to be updated here and there.

EDIT: And now I found the stackexchange comment, here:
http://stackoverflow.com/questions/16131500/py2app-error-in-find-needed-modules-typeerror-nonetype-object-has-no-attribu