python内置函数getitem系列

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class DictDemo:
    def __init__(self,key,value):
        self.dict = {}
        self.dict[key] = value
    def __getitem__(self,key):
        return self.dict[key]
    def __setitem__(self,key,value):
        self.dict[key] = value
    def __len__(self):
        return len(self.dict)
dictDemo = DictDemo('key0','value0')
print(dictDemo['key0']) #value0
dictDemo['key1'] = 'value1'
print(dictDemo['key1']) #value1
print(len(dictDemo)) #2