gdb is the most common tool. But I'm not sure what you'd learn. With an interpreted language like Python, what you get is a traceback that tells you where the interpreter died. Connecting that to a problem in the Python source is almost impossible without intimate knowledge of how the interpreter works.

My experience is that the Python interpreter never crashes due to segfaults; Python programs die with exceptions. Given that fact, I think that a traceback from the console wold be vastly more useful than a crash dump.