All but the last N elements of iterator in Python

Question

What is the best way to get all but the last N elements of an iterator in Python? Here is an example of it in theoretical action:

>>> list(all_but_         


        

Answer 1

For a list you could do this:

def all_but_the_last_n(aList, N):
    return aList[:len(aList) - N]

myList = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
N = 4

print(all_but_the_last_n(myList, N))

Will print:

[0, 1, 2, 3, 4, 5]