Best way to check if an item is present in a list of lists?

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Chapters
00:00 Question
00:33 Accepted answer (Score 18)
01:21 Answer 2 (Score 2)
02:07 Answer 3 (Score 2)
02:28 Answer 4 (Score 1)
02:48 Thank you

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Full question
https://stackoverflow.com/questions/2690...

Accepted answer links:
[itertools.chain.from_iterable]: https://docs.python.org/3.4/library/iter...

Answer 3 links:
[any]: https://docs.python.org/2/library/functi...
[map]: https://docs.python.org/2/library/functi...
[chain]: https://docs.python.org/2/library/iterto...

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Tags
#python #list #python3x

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