在调用某一个类A的方法时，出现以下错误：TypeError: XXX() takes exactly 1 argument (2 given)
Python在调用一个实例的方法是，将instance本身也作为一个参数传入，即
调用方法：insA.method_1(k)
其实调用的是：ins_A.method_1(self, k)
因此在类A中定义方法method_1时，必须包含self参数：
method_1(self, input)
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