d(・ω・d) 微分！(∫・ω・)∫ 積分！∂(・ω・∂) 偏微分！(∮・ω・)∮ 沿閉曲線的積分！(∬・ω・)∬ 重積分！∇(・ω・∇)梯度！∇・(・ω・∇・)散度！∇×(・ω・∇×)旋度！Δ(・ω・Δ)拉普拉斯！#ﾟÅﾟ）⊂彡☆))ﾟДﾟ)･∵ლ(◉◞౪◟◉ )ლ千言萬語，不如一個「表情符號(emoji)」簡單生動又有趣!ಠ▃ಠ生氣、-`д´-憤怒、(¬_¬)無言、(•͈⌔•͈⑅)傷心、哭、開心、大笑、可愛、困惑、發呆、大眼睛、驚呀、跳舞、興奮、奔跑..≧Д≦ （;≧皿≦） (⁎˃ᆺ˂) ╬ Ò ‸ Ó) <(｀^´)> ( >д<) (ꐦ ಠ皿ಠ ) (｀Д´) (;｀O´)o o(-`д´- ｡) ( ˃⌂˂ ) (°ㅂ° ╬) (ʘ言ʘ╬) (Ò 皿 Ó ╬) (-`д´-) 눈_눈 (⋋▂⋌) (¬▂¬) ಠ▃ಠ (＞x＜) ╰（‵□′）╯ D.R.S Dz

Sindbad~EG File Manager

Current Path : /lib64/python3.9/site-packages/setools/diff/
Upload File :
Current File : //lib64/python3.9/site-packages/setools/diff/descriptors.py

# Copyright 2015, Tresys Technology, LLC
#
# SPDX-License-Identifier: LGPL-2.1-only
#
from typing import MutableMapping
from weakref import WeakKeyDictionary


class DiffResultDescriptor:

    """Descriptor for managing diff results."""

    # @properties could be used instead, but there are so
    # many result attributes, this will keep the code cleaner.

    def __init__(self, diff_function: str) -> None:
        self.diff_function = diff_function

        # use weak references so instances can be
        # garbage collected, rather than unnecessarily
        # kept around due to this descriptor.
        self.instances: MutableMapping = WeakKeyDictionary()

    def __get__(self, obj, objtype=None):
        if obj is None:
            return self

        if self.instances.setdefault(obj, None) is None:
            diff = getattr(obj, self.diff_function)
            diff()

        return self.instances[obj]

    def __set__(self, obj, value):
        self.instances[obj] = value

    def __delete__(self, obj):
        self.instances[obj] = None

Sindbad File Manager Version 1.0, Coded By Sindbad EG ~ The Terrorists