Why does this UnboundLocalError occur (closure)?

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Track title: Melt

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Chapters
00:00 Question
00:23 Accepted answer (Score 211)
01:16 Answer 2 (Score 94)
01:58 Answer 3 (Score 30)
02:46 Answer 4 (Score 7)
03:19 Thank you

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Full question
https://stackoverflow.com/questions/9264...

Accepted answer links:
[scope]: http://docs.python.org/3.3/tutorial/clas...
[[1]]: http://docs.python.org/3.3/faq/programmi...
[UnboundLocalError]: http://docs.python.org/3.3/library/excep...
[[2]]: http://docs.python.org/3.3/faq/programmi...
[global]: http://docs.python.org/3.3/reference/sim...
[nonlocal]: http://docs.python.org/3.3/reference/sim...

Answer 2 links:
[global statement]: http://docs.python.org/py3k/reference/si...
[nonlocal statement]: http://docs.python.org/py3k/reference/si...

Answer 3 links:
[nonlocal]: https://docs.python.org/3/reference/simp...

Answer 4 links:
[itertools.count()]: http://docs.python.org/library/itertools...

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Tags
#python #scope #closures #globalvariables

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