[Python-Dev] PEP for Better Control of Nested Lexical Scopes

Guido van Rossum guido at python.org
Sat Feb 25 01:48:23 CET 2006

On 2/24/06, Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:
> Jeremy Hylton wrote:
> > The more practical complaint is that list comprehensions use the same
> > namespace as the block that contains them.
>  > ... but I suspect we're stuck with the
> > current behavior for backwards compatibility reasons.
> There will be no backwards compatibility in 3.0,
> so perhaps this could be fixed then?

Yes that's the plan. [f(x) for x in S] will be syntactic sugar for
list(f(x) for x in S) which already avoids the scope problem.

--Guido van Rossum (home page: http://www.python.org/~guido/)

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