[Python-ideas] with-statement syntactic quirk

Yuval Greenfield ubershmekel at gmail.com
Thu Nov 1 23:06:20 CET 2012

On Thu, Nov 1, 2012 at 1:40 PM, Nick Coghlan <ncoghlan at gmail.com> wrote:

> I've been remiss in not mentioning the new alternative in 3.3 for
> handling nesting of complex context management stacks:
>     with contextlib.ExitStack() as cm:
>         p1 = cm.enter_context(open('/etc/passwd'))
>         p2 = cm.enter_context(open('/etc/passwd'))
> (Note: ExitStack is really intended for cases where the number of
> context managers involved varies dynamically, such as when you want to
> make a CM optional, but you *can* use it for static cases if it seems
> appropriate)
Go's "defer" is quite a neat solution for these hassles if anyone's in the
mood for a time machine discussion.


Yuval Greenfield
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