I don't know if this can help someone, but just in case...
These last months, I've been writing a toolbox with a few wxpython script to import, as the main script has more than 1100 lines. The problem with python is that once a module is imported, it remains in memory, and I've been searching a way to pop it out if there's an error in it, hence this method (I'm writing for Poser12):

import sys

try: sys.modules.pop('my_module')
except: pass
from my_module import MyClass

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