Comment 4 for bug 1156426

The changes fixed the problem! Great work!

Just for posterity, before the changes, the problem occurred by doing the following:

1) run "emacs -q" to avoid loading my .emacs
2) In *scratch* buffer run "eval-region" on following elisp lines:
    (push "~/.emacs.d/elpa/python-mode-6.0.10/" load-path)
    (require 'python-mode)
3) run "find-file" and open original attached file
4) press C-n to move down a line
5) press TAB key
6) minibuffer prints "Variable binding depth exceeds max-specpdl-size" and no tabbing is performed

Changing above push line to read '(push "~/.emacs.d/elpa/python-mode-trunk/" load-path)' (after checking out changes), and the error disappeared.