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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Sun, 14 Oct 2012 18:32:01 -0600
Subject: Re: trouble with nested closures: one of my variables is missing...
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On Sun, Oct 14, 2012 at 3:54 PM, Cameron Simpson <cs@zip.com.au> wrote:
> |  You assign to it, but there's no nonlocal declaration, so Python thinks
> | it's a local var, hence your error.
>
> But 'unset_object' is in locals(). Why one and not the other?
> Obviously there's something about closures here I'm missing.

'unset_object' is in locals because it's a free variable and those are
included in locals(), and it has a value.
'attr_name' is not in locals because while it's a local variable, it
has not been assigned to yet.  It has no value and an attempt to
reference it at that point would result in an UnboundLocalError.