def square_list(list):
if utility.is_null(list):
return utility.list()
else:
return utility.cons(
square(utility.car(list)),
square_list(utility.cdr(list)))
def same_parity_iter(a):
"""
:type a: FunctionType | object
:return:
"""
if is_null(a):
return None
else:
b = car(a) # type: int
if is_even(x - b):
return cons(b, same_parity_iter(cdr(a)))
else:
return same_parity_iter(cdr(a))
def same_parity(x, *z):
"""
:type x: int
:type z: object
:rtype: FunctionType
"""
y = list(*z)
def same_parity_iter(a):
"""
:type a: FunctionType | object
:return:
"""
if is_null(a):
return None
else:
b = car(a) # type: int
if is_even(x - b):
return cons(b, same_parity_iter(cdr(a)))
else:
return same_parity_iter(cdr(a))
return cons(x, same_parity_iter(y))
def make_interval(a, b):
return utility.cons(a, b)
def make_rectangle(p, q):
return utility.cons(p, q)
def make_segment(p, q):
return utility.cons(p, q)
def make_point(x, y):
return utility.cons(x, y)
from utility import cons, list, append, print_list
if __name__ == '__main__':
x = list(1, 2, 3)
y = list(4, 5, 6)
print_list(append(x, y))
print_list(cons(x, y))
print_list(list(x, y))
def make_rectangle(width, height):
return utility.cons(width, height)
def subsets(l):
if is_null(l):
return list(list())
rest = subsets(cdr(l))
return append(rest, map(lambda x: cons(car(l), x) , rest))
def make_rat(n, d):
if d < 0:
return make_rat(-n, -d)
g = gcd(n, d)
return utility.cons(n // g, d // g)
def iter(things, answer):
if is_null(things):
return answer
else:
iter(cdr(things), cons(answer, square(car(things))))