Check if an item is in a nested list

Question

in a simple list following check is trivial:

x = [1, 2, 3]



2 in x  -> True

but if it is a list of list, such as:

x = [[1, 2, 3], [2, 3, 4]]



2 in x   -> False

how can this be addressed in order to return

True

?

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Answer 1

Try this, using the built-in any function. It's the most idiomatic solution, and it's also efficient, because any short-circuits and stops as soon as it finds the first match:

x = [[1, 2, 3], [2, 3, 4]]
any(2 in sl for sl in x)
=> True

Check if an item is in a nested list

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