Прочети кода внимателно

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


class Slotted:
    __slots__ = ("x", "y")

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


r = Regular(1, 2)
s = Slotted(3, 4)

print(r.x, r.y)
print(s.x, s.y)
print(hasattr(r, "__dict__"))
print(hasattr(s, "__dict__"))

r.extra = "ok"
print(r.extra)

try:
    s.extra = "no"
except AttributeError:
    print("rejected")

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