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from dataclasses import dataclass, replace, FrozenInstanceError


@dataclass(frozen=True)
class Point:
    x: int
    y: int


p = Point(1, 2)
print(p)

try:
    p.x = 99
except FrozenInstanceError:
    print("frozen")

p2 = replace(p, y=20)
print(p2)
print(p is p2)
print(p == Point(1, 2))
print(hash(p) == hash(Point(1, 2)))

p3 = replace(p, x=100, y=200)
print(p3)

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