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From: Joshua Landau <joshua.landau.ws@gmail.com>
Date: Mon, 24 Jun 2013 21:19:01 +0100
Subject: Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment)
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Xref: csiph.com comp.lang.python:49077

Here's a little test to make sure you understand (this is one of the
most confusing parts of Python's closures in my opinion):

foo = "I'm foo!"

def working():
    print(foo)

def broken():
    print(foo)

    if False: # There's no way this could cause a problem!
        foo = "This will *never* happen"