[Python-ideas] Fast context creation

[Chris Angelico]

On Thu, Nov 27, 2014 at 11:09 PM, Stefano Borini
<stefano.borini at ferrara.linux.it> wrote:
> I have a situation where, no matter how the routine ends, I need to return the focus to a widget. It would be
> rather clever to do this with a context, but I would expect something like this to be a possible strategy
>
>     with contextlib.context(enter=None, exit=lambda *args: my_widget.setFocus()):
>         do what I need to do
>
> as far as I know, at the moment it's not possible. Am I right? I think it would be an easy and practical
> addition to the contextlib module to quickly register two routines for enter and exit.

You could abuse try/finally for this purpose.

try:
    whatever you need to do
finally:
    my_widget.setFocus()

ChrisA