named_tuple_size.py

from collections import namedtuple

from pympler.asizeof import asizeof


class PointSimple:
    def __init__(self, x, y):
        self.x = x
        self.y = y


class PointNamedTuple(namedtuple('PointNamedTuple', ['x', 'y'])):
    __slots__ = ()

    @property
    def hypot(self):
        return (self.x ** 2 + self.y ** 2) ** 0.5

    def __str__(self):
        return f'Point: x={self.x}  y={self.y}  hypot={self.hypot}'


class PointNoSlots(namedtuple('PointNoSlots', ['x', 'y'])):
    @property
    def hypot(self):
        return (self.x ** 2 + self.y ** 2) ** 0.5

    def __str__(self):
        return f'Point: x={self.x}  y={self.y}  hypot={self.hypot}'


classes = PointSimple, PointNamedTuple, PointNoSlots
for cls in classes:
    print(f'class = {cls.__name__}; real size = {asizeof(cls(1, 2))}')

class = PointSimple; real size = 328
class = PointNamedTuple; real size = 120
class = PointNoSlots; real size = 128