Dennis Lee Bieber wrote:
> References to lists, dictionaries, and class instances (which are,
> in a way, just an expanded dictionary) are "mutable"
careful: it's not the *reference* that's mutable, it's the object.
the *only* difference between mutable and immutable objects is that
the latter don't provide any methods that you could use to modify their
contents.
plain assignment (name=) *never* modifies objects, and *never* copies
objects.
this article
http://effbot.org/zone/python-objects.htm
may be useful for those who haven't already seen it.
</F>
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