Keep references for __del__ #1
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During shutdown, module globals can be set to None before del is called, so when using del you need to explicitly keep references to those things you need for cleanup purposes.
Without this, I sometimes get "AttributeError: NoneType has no attribute 'name'" and the cleanup code doesn't get called, because its testing "if os.name == 'nt'". (This might just be a Python 2.7 issue: I don't remember when cleanup started explicitly setting globals to None)