import tracemalloc

class Point(object):
    def __init__(self, x, y):
        self.x = x
        self.y = y
class GoodPoint(object):
    __slots__ = ('x', 'y')
    def __init__(self, x, y):
        self.x = x
        self.y = y

def measure_heap(point_type):
    snapshot1 = tracemalloc.take_snapshot()
    x = [point_type(i, i) for i in range(1000000)]
    snapshot2 = tracemalloc.take_snapshot()
    return snapshot2.compare_to(snapshot1, 'lineno')

tracemalloc.start()
for t in (Point, GoodPoint):
    print('----')
    res = measure_heap(t)
    for stat in res[:2]:
        print(stat)