Python类的__getitem__和__setitem__特殊方法

class testsetandget:
    kk = {};  
    def __getitem__(self, key):  
        return self.kk[key];  
    def __setitem__(self, key, value):  
        self.kk[key] = value;

a = testsetandget()
a['first'] = 1
print a['first']

a.__setitem__('second', 2)
print a.__getitem__('second')
print a['second']

输出：

1

2

2