[Python-ideas] Fwd: quantifications, and tuple patterns

Paul Moore p.f.moore at gmail.com
Tue Jan 17 14:34:21 CET 2012

On 17 January 2012 11:16, Nick Coghlan <ncoghlan at gmail.com> wrote:
> Assignments as expressions aren't all that easy to use in the "some"
> case that started the thread, and the reason is the same as the reason
> iteration variables in comprehensions don't leak into the surrounding
> scope any more: generator expressions and comprehensions create their
> own scope, separate from that of the containing function.

Ah. I tested the idea by setting an attribute of an existing object,
which *does* work (but is ugly). I'd forgotten that scoping comes into
the picture when you switch to assignment.

I'll refrain from proposing "nonlocal x := var"... :-)


More information about the Python-ideas mailing list