min..max 0..1 → 0個か1個 1 → 必ず1個 1..* → 1個以上 2..5 → 2〜5個 * → 何個でもOK ③ 複数OK（*） class Author: def __init__(self): self.books = [] # 何冊でもOK def write_book(self, title): self.books.append(title) author = ...

Pythonで複数のデータをまとめて扱う際、「list（リスト）」と並んで便利なのが「set（集合型）」です。setは「重複する要素を持たない」という非常に強力な特徴を持っています。 listと同じく、setも「ミュータブル（変更可能）」なデータ型です。 つまり ...

Python is a popular programming language that comes with a wide range of features to deal with lists. Lists are used to store multiple items in a single variable, making it easier to manipulate and ...

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