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 = [[         


        

Answer 1

The Óscar Lopez answer is so great! I recommend to use it.

However, you can use itertools to flatten the list and eval it, so:

import itertools

x = [[1, 2, 3], [2, 3, 4]]
2 in itertools.chain.from_iterable(x)

Output: True

Also, you can make it "manually" through comprehension:

x = [[1, 2, 3], [2, 3, 4]]
2 in [item for sub_list in x for item in sub_list]

Output: True

These're only other ways to make it, good luck.