[Python-Dev] PEP for Better Control of Nested Lexical Scopes
mrussell at verio.net
Tue Feb 21 23:56:34 CET 2006
On 21 Feb 2006, at 21:13, Ian Bicking wrote:
> By rebinding operator, does that mean it is actually an operator?
> # Required assignment to declare?:
> chunk = None
> while chunk := f.read(1000):
No, I think that "x := y" should be a statement not an expression
(i.e. just like "x = y" apart from the treatment of bindings).
I'd be inclined to require that the target of := be already bound, if
only to prevent people randomly using ":=" in places where it's not
In a new language I would probably also make it an error to use = to
do rebinding (i.e. insist on = for new bindings, and := for
rebindings). But that's obviously not reasonable for python.
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