[Python-ideas] local is safer than global

[Cesare Di Mauro]

2010/6/13 Antoine Pitrou <solipsis at pitrou.net>

> On Fri, 11 Jun 2010 21:18:48 -0400
> Demur Rumed <junkmute at hotmail.com> wrote:
> >
> > For example,
> >
> > def f(x):
> >     a.append(x)
> >     if len(a)>5:a=[5]
> >
> > If a is bound as a local, this throws an UnboundLocalError. Why then is
> it not set to try the global namespace, that place we cannot be so certain
> of the exception in?
> >
> > It comes down to the view of UnboundLocalError as a feature or a bug
>
> Certainly a feature. In case of ambiguity, a variable should be
> considered local rather than global. It makes the language much safer.
>
> It's also why I'm -1 on your proposal.
>
> Regards
>
> Antoine.
>
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Locals are also MUCH faster...

Cesare
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