# This is file listparts.py

def ends(l):
    return [ l[0], l[len(l)-1] ] # return a list of the first and last elements


def middle(alist):               # return a list of middle one or two elements
    length = len(alist)

    if ( length % 2 ) == 0 :     # Even length
         return [ alist[length/2-1], alist[length/2] ]  # return list of size 2

    else:                        # Must be odd length   
         return [ alist[length/2] ]                     # return list of size 1