Re: [Python-ideas] immutable classes [was: pre-PEP: Default Argument Expressions]

"Jan Kanis" wrote:

On Tue, 20 Feb 2007 00:17:53 +0100, Josiah Carlson wrote:

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"Jan Kanis" wrote:

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I just hope if python were designed today it would have done these. </mode>

Probably not. Value binding breaks closures.

That depends on how you exactly define closures. The basics of having an inner function with free variables and initializing those free variables to the values they have in the parent scope still works.

It would break closures as defined for Python version 1.? to Python 2.5, Python 3.x, and beyond. Changing the semantics of Python closures is not the right thing to do, whether in 2.6, 3.x or otherwise. - Josiah