python

Nested lists

A list that contains lists is sometimes called nested. We define the nesting depth of a list as follows:

A list that does not contain any list has a nesting depth of zero

A list that contains lists has a nesting depth equal to the maximum nesting depth of the lists it contains, plus one.

Note that a list that contains lists can also contain values that are not lists.

For example, the nesting depth of [[1,2], [2,4]] is 1, while the nesting depth of [1, [2], [[3], [[4], 5]]] is 3.

Write a function that takes as argument a list and returns its nesting depth.

What does your function return when called with the list [[[]]]? (and is that what it should return?)