标签：游戏 and 机器 ranch its 函数 __str__ code asa
1.字典通过__getitem__,__setitem__,__delitem__实现 对象[] 操作
2.__new__考试会考
3.单例模式 每个对象只有被允许有一个实例 __new__
4.__hash__ hash()
5.__eq__ ==
6.hashlib
提供摘要算法，
摘要功能：对相同的字符串使用同一个算法进行摘要，得到的值总是不变的
sha算法——随着复杂程度的增加，摘要的需要的时间、内存增加
摘要功能
1.密码的密文存储
2.文件的一致性验证
a.下载文件，检查本地与服务器上的文件是否一致
b.两台机器上的两个文件，检查文件是否相同
7.加盐
增强加密的安全性
md5 < 加盐 < 动态加盐
文件的一致性校验，不加盐
1.item内置函数
class Foo: def __init__(self,name): self.name = name def __getitem__(self, item): print(self.__dict__[item]) def __setitem__(self, key, value): print(‘__setitem__‘) self.__dict__[key] = value def __delitem__(self, key): self.__dict__.pop(key) print(‘__delitem__‘) def __delattr__(self, item): self.__dict__.pop(item) print(‘__delattr__‘) a1 = Foo(‘egon‘) a1[‘name‘] a1[‘age‘] = 0 print(a1.__dict__) del a1[‘age‘] print(a1.__dict__) del a1.name print(a1.__dict__)
2.单例模式，每个对象只被允许有一个实例化
class Singleton: def __new__(cls, *args, **kwargs): if not hasattr(cls,"_instance"): cls._instance = object.__new__(cls) return cls._instance one = Singleton() two = Singleton() two.a = 3 print(one.a) print(id(one)) print(id(two)) print(one == two) print(one is two)
3.纸牌游戏
from collections import namedtuple import json import pickle Card = namedtuple(‘Card‘,[‘rank‘,‘suit‘]) class FranchDeck: ranks = [str(i) for i in range(2,11)] + list(‘JQKA‘) suits = [‘红桃‘,‘黑桃‘,‘方块‘,‘梅花‘] def __init__(self): self._cards = [Card(rank,suit) for rank in FranchDeck.ranks for suit in FranchDeck.suits] def __getitem__(self, item): return self._cards[item] def __len__(self): return len(self._cards) def __setitem__(self, key, value): self._cards[key] = value def __str__(self): return json.dumps(self._cards,ensure_ascii=False) # 抽牌比大小 deck = FranchDeck() print(deck[10],type(deck[10])) # from random import choice # print(choice(deck)) # print(choice(deck)) # 洗牌 from random import shuffle shuffle(deck) print(deck) print(deck._cards[:5]) print(deck[:5])
4.hashlib
import hashlib pwd = ‘sa12356‘ md5 = hashlib.md5() md5.update(bytes(pwd,encoding=‘utf-8‘)) md5_pwd = md5.hexdigest() print(md5_pwd)
标签：游戏 and 机器 ranch its 函数 __str__ code asa
原文地址：https://www.cnblogs.com/wan2-0/p/10805310.html
