def upper_bound(z):
return max([car(z), cdr(z)])
def y_point(point):
return cdr(point)
def lower_bound(z):
return min([car(z), cdr(z)])
def right_bottom(rectangle):
return cdr(rectangle)
def end_segment(segment):
return cdr(segment)
def append(list1, list2):
if null(list1):
return list2
return cons(car(list1), append(cdr(list1), list2))
def list_ref(items, n):
if (n == 0):
return car(items)
return list_ref(cdr(items), n - 1)
def length(items):
if (null(items)):
return 0
return 1 + length(cdr(items))
def denom(x):
return cdr(x)
from util_pair import cons, car, cdr, list, print_list x = cons(1, cons(2, cons(3, cons(4, None)))) print_list(x) one_through_four = list([1, 2, 3, 4]) print_list(one_through_four) print(car(one_through_four)) print_list(cdr(one_through_four)) print(car(cdr(one_through_four))) print_list(cons(10, one_through_four)) print_list(cons(5, one_through_four))
def numer(x):
g = gcd(car(x), cdr(x))
return int(car(x) / g)
def denom(x):
g = gcd(car(x), cdr(x))
return int(cdr(x) / g)
