Modifying Textmate's Python bundle “Run Script (cmd r)” to display full traceback

Question

by default it raises the Error, but omits the actual Traceback e.g. (from Terminal):

Traceback (most recent call last):
  File "~/Documents/test.py", line 504, in <module>
    assert result == {}
AssertionError

in Textmate/HTML Output becomes the less informative:

AssertionError:

in the bundle editor it appears buried behind:

(ruby)
TextMate::Executor.run()

any thoughts or alternatives greatly appreciated