Why does this UnboundLocalError occur (closure)?

closurespythonscopeglobal-variables
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How to generate all permutations of a list

pythonalgorithmpermutationcombinatorics
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How to add to the PYTHONPATH in Windows, so it finds my modules/packages?

pythonwindowsenvironment-variablespythonpath
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Calling a function of a module by using its name (a string)

pythonobjectreflection
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Why does append() always return None in Python?

pythonlistappendnonetype
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