python基础一 day28 进阶

港控/mmm° 2024-04-20 11:04 75阅读 0赞

dic = \{'k':'v'\}  
\# 对象 ： 存储属性 和调用方法  
dic\['k'\] = 'v'  
\# class Foo:  
\# def \_\_init\_\_(self,name,age,sex):  
\# self.name = name  
\# self.age = age  
\# self.sex = sex  
\#  
\# def \_\_getitem\_\_(self, item):  
\# if hasattr(self,item):  
\# return self.\_\_dict\_\_\[item\]  
\#  
\# def \_\_setitem\_\_(self, key, value):  
\# self.\_\_dict\_\_\[key\] = value  
\#  
\# def \_\_delitem\_\_(self, key):  
\# del self.\_\_dict\_\_\[key\]  
\#  
\# f = Foo('egon',38,'男')  
\# print(f\['name'\])  
\# f\['hobby'\] = '男'  
\# print(f.hobby,f\['hobby'\]) \#前面是自带的，后面通过setitem获得的  
\# del f.hobby \# object 原生支持 \_\_delattr\_\_  
\# del f\['hobby'\] \# 通过自己实现的  
\# print(f.\_\_dict\_\_)

\# \_\_init\_\_ 初始化方法  
\# \_\_new\_\_ 构造方法 : 创建一个对象  
class A:  
def \_\_init\_\_(self):  
self.x = 1  
print('in init function')  
\# def \_\_new\_\_(cls, \*args, \*\*kwargs):  
\# print('in new function')  
\# return object.\_\_new\_\_(A, \*args, \*\*kwargs)

\# a1 = A()  
\# a2 = A()  
\# a3 = A()  
\# print(a1)  
\# print(a2)  
\# print(a3)  
\# print(a.x)

\# 设计模式  
\# 23种  
\# 单例模式  
\# 一个类 始终 只有 一个 实例  
\# 当你第一次实例化这个类的时候 就创建一个实例化的对象  
\# 当你之后再来实例化的时候 就用之前创建的对象

\# class A:  
\# \_\_instance = False  
\# def \_\_init\_\_(self,name,age):  
\# self.name = name  
\# self.age = age  
\# def \_\_new\_\_(cls, \*args, \*\*kwargs):  
\# if cls.\_\_instance:  
\# return cls.\_\_instance  
\# cls.\_\_instance = object.\_\_new\_\_(cls)  
\# return cls.\_\_instance  
\#  
\# egon = A('egg',38)  
\# egon.cloth = '小花袄'  
\# nezha = A('nazha',25)  
\# print(nezha)  
\# print(egon)  
\# print(nezha.name)  
\# print(egon.name)  
\# print(nezha.cloth)

\# class A:  
\# def \_\_init\_\_(self,name):  
\# self.name = name  
\#  
\# def \_\_eq\_\_(self, other):  
\# if self.\_\_dict\_\_ == other.\_\_dict\_\_:  
\# return True  
\# else:  
\# return False  
\#  
\# ob1 = A('egon')  
\# ob2 = A('egg')  
\# print(ob1 == ob2)

\# hash() \#\_\_hash\_\_  
\# class A:  
\# def \_\_init\_\_(self,name,sex):  
\# self.name = name  
\# self.sex = sex  
\# def \_\_hash\_\_(self):  
\# return hash(self.name+self.sex)  
\#  
\# a = A('egon','男')  
\# b = A('egon','nv')  
\# print(hash(a))  
\# print(hash(b))  
import json  
from collections import namedtuple  
Card = namedtuple('Card',\['rank','suit'\]) \# rank 牌面的大小 suit牌面的花色  
\# class FranchDeck:  
\# ranks = \[str(n) for n in range(2,11)\] + list('JQKA') \# 2-A  
\# suits = \['红心','方板','梅花','黑桃'\]  
\#  
\# def \_\_init\_\_(self):  
\# self.\_cards = \[Card(rank,suit) for rank in FranchDeck.ranks  
\# for suit in FranchDeck.suits\]  
\#  
\# def \_\_len\_\_(self):  
\# return len(self.\_cards)  
\#  
\# def \_\_getitem\_\_(self, item):  
\# return self.\_cards\[item\]  
\#  
\# def \_\_setitem\_\_(self, key, value):  
\# self.\_cards\[key\] = value  
\#  
\# def \_\_str\_\_(self):  
\# return json.dumps(self.\_cards,ensure\_ascii=False)

\# deck = FranchDeck()  
\# print(deck\[10\])  
\# from random import choice  
\# print(choice(deck))  
\# \# print(choice(deck))  
\# from random import shuffle  
\# shuffle(deck)  
\# print(deck\[10\])  
\# print(deck)  
\# print(deck\[:5\])

\# 内置函数 内置的模块 内置的基础类型 < --- >类的内置方法  
\# == \_\_eq\_\_  
\# len() \_\_len\_\_

\# 100 名字 和 性别 年龄不同  
\# set  
\# class A:  
\# def \_\_init\_\_(self,name,sex,age):  
\# self.name = name  
\# self.sex = sex  
\# self.age = age  
\#  
\# \# def \_\_eq\_\_(self, other):  
\# \# if self.name == other.name and self.sex == other.sex:  
\# \# return True  
\# \# return False  
\#  
\# def \_\_hash\_\_(self):  
\# return hash(self.name + self.sex)  
\# a = A('egg','男',38)  
\# b = A('egg','男',37)  
\# print(set((a,b))) \# unhashable

\# set 依赖对象的 hash eq

转载于:https://www.cnblogs.com/wang-tan/p/11388428.html