Appending a list inside np.array() does not work like doing it separately

Question

I was hanging around with numpy, trying to create an array from a list that I faced something very strange.

list = [range(5), range(5)]
arr1 = np.array(list)

Now, if I say:

list.append(range(5))
arr2 = np.array(list)

everything works fine, however, if I directly say:

arr3 = np.array(list.append(range(5)))

it returns:

array(None, dtype=object)

Anyone knows what the problem is?

Answer 1

list.append doesn't return the list, it just performs the action and returns None.