[問題] method宣告self為參數到底有啥用?
為何method一定要將self寫進宣告中呢?
實際在呼叫的時候不是也用不到嗎?
搞不太懂這個設計,總覺得很多餘......
希望有人能為我解惑,
謝謝。
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