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item_056_example_12.py
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executable file
·46 lines (36 loc) · 1.44 KB
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#!/usr/bin/env PYTHONHASHSEED=1234 python3
# Copyright 2014-2024 Brett Slatkin, Pearson Education Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
print("아이템 56")
print("Example 12")
# Check types in this file with: python3 -m mypy <path>
from typing import Any, Final, Never
class ImmutablePoint:
name: Final[str]
x: Final[int]
y: Final[int]
def __init__(self, name: str, x: int, y: int) -> None:
self.name = name
self.x = x
self.y = y
def __setattr__(self, key: str, value: Any) -> None:
if key in self.__annotations__ and key not in dir(self):
# Allow the very first assignment to happen
super().__setattr__(key, value)
else:
raise AttributeError("불변 객체: set을 쓸 수 없음")
def __delattr__(self, key: str) -> Never:
raise AttributeError("불변 객체: del을 쓸 수 없음")
origin = ImmutablePoint("origin", 0, 0)
origin.x = -3