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  • python常用抽象基类1

    from abc import abstractmethod
    from collections.abc import Container, Sized, Iterable, Iterator
    from collections.abc import Sequence, Mapping, Set
    from collections.abc import MutableSequence, MutableMapping, MutableSet
    from collections.abc import MappingView, ItemsView, KeysView, ValuesView
    from collections.abc import Callable, Hashable
    
    
    class UserContainer(Container, Sized, Iterable):
    
        # 对应len()方法
        def __len__(self) -> int:
            return len(self.items)
    
        # 对应in关键字
        def __contains__(self, x: object) -> bool:
            return x in self.items
    
        def __init__(self):
            self.items = list()
            self.index = 0
    
        def append(self, obj):
            self.items.append(obj)
    
        # 和__iter__一起实现for in语法
        def __next__(self):
            if self.index < len(self.items):
                v = self.items[self.index]
                self.index += 1
                return v
            else:
                raise StopIteration
    
        def __iter__(self):
            return self
    
    
    # Sequence是Container, Sized, Iterable子类
    class UserList(Sequence):
    
        def __init__(self):
            self.data = list()
            self.data.append(1)
            self.data.append(2)
    
        def __len__(self) -> int:
            return len(self.data)
    
        # 实现分片取数[]能力
        def __getitem__(self, i: int):
            return self.data[i]
    
    
    class UserMap(Mapping):
        def __init__(self):
            self.data = dict()
            self.index = 0
            self.data['a'] = 1
            self.data['b'] = 2
    
        def __len__(self) -> int:
            return len(self.data)
    
        def __iter__(self):
            return self
    
        # 实现v=data[k]取数语法
        def __getitem__(self, k):
            return self.data[k]
    
        # 实现data[k]=赋值语法
        def __setitem__(self, key, value):
            self.data[key] = value
    
    
    class UserSet(Set):
    
        def __init__(self):
            self.data = set()
            self.data.add(6)
            self.data.add(7)
    
        def __contains__(self, x: object) -> bool:
            return x in self.data
    
        def __len__(self) -> int:
            return len(self.data)
    
        def __iter__(self):
            return self
    
    
    if __name__ == '__main__':
        u = UserContainer()
        u.append("u1")
        u.append("u2")
        u.append("u3")
        print("u1" in u)
        print(len(u))
        print("========")
        for i in u:
            print(i)
        print("========")
    
        u3 = UserList()
        print(u3[1])
        print("************")
        for i in u3:
            print(i)
        print("************")
    
        u4 = UserMap()
        u4['c'] = 3
        print(u4['a'])
    
        u5 = UserSet()
        print(9 in u5)
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  • 原文地址:https://www.cnblogs.com/wangbin2188/p/15314552.html
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