Lab8 - Q0

# Question 0 - Iterative Version
def contains_iterative(n, l):
    """Returns True if n is in rlist l and False otherwise.
 
    >>> foo_lst = make_rlist(1, make_rlist(2, make_rlist(3, empty_rlist)))
    >>> contains_iterative(5, foo_lst)
    False
    >>> contains_iterative(1, foo_lst)
    True
    """
    found = False
    while (not rest(l) == None) and (not found):
        if first(l) == n:
            found = True
        else:
            l = rest(l)
    return found