Python mode in Emacs: No such file or directory, pdb

Question

I have a python script that I want to debug with python-mode. I read in this thread that I can debug my python script with M-x pdb, however I get the following

Answer 1

To run the Python Debugger, M-x pdb expects to find an executable named pdb. While the pdb executable may exist in some Python distributions, it doesn't exist in all of them.

A proposal to fix this is in GNU bug report #21521: pdb default suggested command.

Until the bug is fixed, you can set the variable gud-pdb-command-name to define the command used to launch pdb. In .emacs, add...

(setq gud-pdb-command-name "python -m pdb")