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python重写父类方法

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class MyList:
    def __init__(self, start):
        #self.wrapped = start[:]                
        self.wrapped = []                       
        for x in start: self.wrapped.append(x)
    def __add__(self, other):
        return MyList(self.wrapped + other)
    def __mul__(self, time):
        return MyList(self.wrapped * time)
    def __getitem__(self, offset):
        return self.wrapped[offset]
    def __len__(self):
        return len(self.wrapped)
    def __getslice__(self, low, high):
        return MyList(self.wrapped[low:high])
    def append(self, node):
        self.wrapped.append(node)
    def __getattr__(self, name):                
        return getattr(self.wrapped, name)
    def __repr__(self):
        return 'self.wrapped'

class MyListSub(MyList):
    calls = 0                                  

    def __init__(self, start):
        self.adds = 0                          
        MyList.__init__(self, start)

    def __add__(self, other):
        MyListSub.calls = MyListSub.calls + 1  
        self.adds = self.adds + 1              
        return MyList.__add__(self, other)

    def stats(self):
        return self.calls, self.adds           

if __name__ == '__main__':
    x = MyListSub('A')
    y = MyListSub('B')
    print x[0]
    print x[1:]
    print x + ['C']
    print x + ['D']
    print y + ['E']
    print x.stats()

标签:Python,Class

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