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

This would work:

for arr in x:
    if 2 in arr:
        print True
        break

I would recommend Oscar's answer as any is the right option here.

Answer 2

try

 2 in [i for sublist in x  for i in sublist]