From BlenderWiki

Python Tips

I'm collecting useful script snippets here, that might also help others.

Debugging

Interactive console

For interactive debugging in the middle of some python code just insert this line as "breakpoint":

__import__("code").interact(local=locals())

Blender Game Engine

Find out the objects that have logic bricks that use a specific text block

Sounds difficult, but can be useful sometimes.

for text in bpy.data.texts: print(text.name, text.users_logic)