collections

from collections import deque

q = deque((), 3)
for i in range(5):
    q.append(i)
    print(list(q))

q2 = deque((), 3)
for i in range(5):
    q2.appendleft(i)
    print(list(q2))


from collections import namedtuple

Point = namedtuple("Point", ("x", "y"))
p = Point(11, 22)
print(p.x, p.y)


from collections import OrderedDict

od = OrderedDict()
od["first"] = 1
od["second"] = 2
od["third"] = 3
print(od)

for k, v in od.items():
    print(k, v)