def sum(lst, var=0): """Returns the sum of the list usng recursion.""" if len(lst) == 0: return var #base case return sum(lst[2:], var + lst[0])

def sum(lst, var=0):
    """Returns the sum of the list usng recursion."""
    
    if len(lst) == 0:
        return var #base case
    
    return sum(lst[2:], var + lst[0])