之前寫程序經常會碰到此類問題，確認發現並沒有少參數。函數為類下函數，定義時需要添加self參數。
但是！但是！為何Python給self賦值而你不必給self賦值？
創建了一個類MyClass，實例化MyClass得到了MyObject這個對象，
然后調用這個對象的方法MyObject.method(arg1,arg2)，
這個過程中Python會自動轉為Myclass.mehod(MyObject,arg1,arg2)。
takes 3 positional arguments but 4 were given錯誤
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