TypeError: 'NoneType' object is not iterable in Python

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Track title: Puddle Jumping Looping

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Chapters
00:00 Question
00:23 Accepted answer (Score 262)
00:34 Answer 2 (Score 114)
03:43 Answer 3 (Score 64)
04:38 Answer 4 (Score 20)
05:43 Thank you

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Full question
https://stackoverflow.com/questions/3887...

Answer 1 links:
[Python's Coding Style Guidelines - PEP-008]: https://www.python.org/dev/peps/pep-0008...
[Python's duck-typing]: https://en.wikipedia.org/wiki/Duck_typin...

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Tags
#python #nonetype

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