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Quoth Peter Abel:
[...]
> Is there really a difference in namespacehandling depending
> on writing or reading variables?

Yes. Assigned-to variables are local; variables merely referred
to may be found in nested scopes.

"When a name is used in a code block, it is resolved using the
nearest enclosing scope. [...] If a name is bound in a block, it
is a local variable of that block. [...] If a name binding
operation occurs anywhere within a code block, all uses of the
name within the block are treated as references to the current
block. [...] The local variables of a code block can be determined
by scanning the entire text of the block for name binding
operations."
<http://www.python.org/doc/current/ref/naming.html>

(Note that defs and whatnot are also name-binding operations.)

--
Steven Taschuk w_w
,-= U
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