[Tutor] Good writeup on Python assignment semantics

[Kent Johnson]

Kent Johnson wrote:
> I think to write correct programs in any language, you must have a 
> correct mental model of what the program is doing, where by 'correct' I 
> mean a model that is consistent with the actual behaviour of the program.

Here is a sketch of what the different parts of a model for Python might be:
http://wiki.python.org/moin/ConceptualRoadmap

Kent