之前写程序经常会碰到此类问题，确认发现并没有少参数。函数为类下函数，定义时需要添加self参数。
但是！但是！为何Python给self赋值而你不必给self赋值？
创建了一个类MyClass，实例化MyClass得到了MyObject这个对象，
然后调用这个对象的方法MyObject.method(arg1,arg2)，
这个过程中Python会自动转为Myclass.mehod(MyObject,arg1,arg2)。
takes 3 positional arguments but 4 were given错误
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