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类补充

  1 #!/usr/bin/env python
  2 # -*- coding:utf-8 -*-
  3 
  4 ###########接口######################
  5 # class Iorderddd():
  6 #     def fetch_one_by(self,nid):
  7 #         raise Exception(‘子类必须实现该方法‘)
  8 #
  9 # class aaa(Iorderddd):
 10 #     def fetch_one_by(self, nid):
 11 #         print(nid)
 12 # aa = aaa()
 13 # aa.fetch_one_by(1)
 14 
 15 ###########抽象类,抽象方法######################
 16 # import abc
 17 # class Foo(metaclass=abc.ABCMeta):
 18 #     def f1(self):
 19 #         print(‘123‘)
 20 #
 21 #     @abc.abstractmethod
 22 #     def f2(self):
 23 #         ‘‘‘
 24 #
 25 #         :return:
 26 #         ‘‘‘
 27 #
 28 # class Bar(Foo):
 29 #     def f2(self):
 30 #         print(‘3333‘)
 31 #
 32 # b = Bar()
 33 # b.f2()
 34 ###########组合######################
 35 # class Foo:
 36 #     def f1(self):
 37 #         pass
 38 #     def f2(self):
 39 #         pass
 40 #
 41 # class SqlHelper:
 42 #     def __init__(self,f):
 43 #         self.f = f
 44 #     def fetch_one(self):
 45 #         self.f.f1()
 46 #     def fetch_all(self):
 47 #         pass
 48 # class UserInfo:
 49 #     def __init__(self,helper):
 50 #         self.s = helper
 51 #     def login(self):
 52 #         self.s.fetch_one()
 53 #     def loginout(self):
 54 #         self.s.fetch_one()
 55 #     def userlist(self):
 56 #         self.s.fetch_all()
 57 # f = Foo()
 58 # b = SqlHelper(f)
 59 # obj = UserInfo(b)
 60 # obj.login()
 61 # 类作为参数传入到另一个类中,降低耦合
 62 
 63 ########## 类创建的本质######################
 64 # class Foo:
 65 #     def __init__(self):
 66 #         self.name = 123
 67 #     def f1(self):
 68 #         print(‘f1‘)
 69 # # 解释器执行步骤
 70 # # 1、遇到class Foo 执行Type的__init__方法
 71 # # 2、type的init方法。。。
 72 # obj = Foo()
 73 # 3、执行type的__call__方法
 74 #       执行Foo类的__new__方法
 75 #       执行Foo类的__init__方法
 76 
 77 ########## 自定义type######################
 78 # class MyType(type):
 79 #     def __call__(cls, *args, **kwargs):
 80 #         obj = cls.__new__(cls,*args,**kwargs)
 81 #         print(‘==========‘)
 82 #         obj.__init__(*args,**kwargs)
 83 #         return obj
 84 # class Foo(metaclass=MyType):
 85 #     def __init__(self,name):
 86 #         print(‘---------‘)
 87 #         self.name = name
 88 #     def f1(self):
 89 #         print(self.name)
 90 # obj = Foo(123)
 91 # print(obj)
 92 # print(obj.name)
 93 ########## 依赖注入######################
 94 class Mapper:
 95     __mapper_relation ={}
 96     @staticmethod
 97     def register(cls,value):
 98         Mapper.__mapper_relation[cls]=value
 99     @staticmethod
100     def exist(cls):
101         if cls in Mapper.__mapper_relation:
102             return True
103         return False
104     @staticmethod
105     def value(cls):
106         return Mapper.__mapper_relation[cls]
107 class MyType(type):
108     def __call__(cls, *args, **kwargs):
109         obj = cls.__new__(cls,*args,**kwargs)
110         arg_list = list(args)
111         if Mapper.exist(cls):
112             value =http://www.mamicode.com/ Mapper.value(cls)
113             arg_list.append(value)
114         obj.__init__(*arg_list,**kwargs)
115         return obj
116 class Foo(metaclass=MyType):
117     def __init__(self,name):
118         self.name = name
119     def f1(self):
120         print(self.name)
121 
122 class Bar(metaclass=MyType):
123     def __init__(self,name):
124         self.name = name
125     def f1(self):
126         print(self.name)
127 Mapper.register(Foo,666)
128 Mapper.register(Bar,999)
129 f = Foo()
130 print(f.name)
131 b= Bar()
132 print(b.name)
133 ##############程序设计原则#############
134 ‘‘‘SOLIP设计原则
135   1、单一责任原则(SRP)
136     一个对象对只应该为一个元素负责
137   2、开放封闭原则(OCP)
138     对扩展开放,修改封闭
139   3、里氏替换原则(LSP)
140     可以使用任何派生类替换基类
141   4、接口分离原则(ISP)
142     对于接口进行分类避免一个接口的方法过多
143   5、依赖倒置原则(DIP)
144     隔离关系,使用接口或抽象类代指
145   6、依赖注入(DI)和控制反转原则(ICO)
146     使用钩子再原来执行流程中注入其他对象
147 ‘‘‘

 

类补充