On 3/30/07, Richard Brown <[EMAIL PROTECTED]> wrote:
> On 30/03/07, [EMAIL PROTECTED]
> <[EMAIL PROTECTED]> wrote:
> >
> > Not sure what region[:] is supposed to achieve. You are creating a copy
> > with the same name, so you are over-riding the original variable.
> >
>
> That doesn't seem to be the case - it returns the right thing on the
> first call - i.e. region got changed, but on subsequent calls the
> figure is displayed and the function returns array([0,0,0,0]). I
> thought taking the slice just gave access to the internals of region
> ...
>
> How does one assign a new value to a variable in a containing scope?
You can declare the "region" variable as global in keypressed():
def keypressed(event):
global region
region = ...
and "region" does not need to get initialized in the containing scope.
Cheers,
~ Antonio
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