[Python-Dev] more timely detection of unbound locals

Eli Bendersky eliben at gmail.com
Mon May 9 17:01:06 CEST 2011

> I think you are making an unwarranted assumption about what is "more
> expected". I presume you are thinking that the expected behaviour is that
> foo() should:
> print global x (5)
> assign 1 to local x
> print local x (1)
> If we implemented this change, there would be no more questions about
> UnboundLocalError, but instead there would be lots of questions like "why is
> it that globals revert to their old value after I change them in a
> function?".

True, but this is less confusing and follows the rules in a more
straightforward way. x = 1 without a 'global x' assigns a local x, this make
sense and is similar to what happens in C where an inner declaration
temporarily shadows a global one.

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