object of type NoneType has no len

Question

def medianeven (L):
    while len(L) > 2:
        L = L[1:(len(L)-1)]
    return average (L)

def medianodd (L):
    while len(L) > 1:
        L = L[1:(len(L)-         


        

Answer 1

.sort() is in-place and returns None.

Change this line:

new = L.sort()

To just this:

L.sort()

And replace all of your instances of new with just L. You also need to return the results of those function calls:

if a % 2 == 0:
    return medianeven(new)
else:
    return medianodd(new)

Also, Python's slices support negative indices, so this code:

L[1:(len(L)-1)]

Can be simplified to just

L[1:-1]

Answer 2

The sort() method call you have in the line:

new = L.sort();

doesn't return anything. Thus 'new' holds 'None', which has no length. I believe doing L.sort() will sort the list in place. Don't need to store it in 'new'.