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I can't understand how and why dict3 is empty. dictは、キー（Key）と値（Value）のペアを格納することができます。 キーは一意であり、それに対応する値を迅速に検索することができます。 dictは波括弧 {} を使用して作成され、キーと値はコロン : を使用して区切ります。 以下は、dictの基本的な構文です。 ここで、key1、key2、key3はキーであり、value1、value2、value3はそれぞれのキーに対応する値です。キーと値のペアはカンマ , で区切られます。 dictのキーは一意である必要があります。 つまり、同じキーを複数回使用することはできません。 ただし、値は重複していても構いません。 This article offers 40 Python dictionary practice questions, organized by difficulty, to help you get comfortable with New items are added to a dictionary using the assignment operator (=) by giving a new key a value. Explore syntax, methods, and real-world examples to manage Python has a set of built-in methods that you can use on dictionaries. com To try more Python Exercises please visit our Python Exercisespage. Learn how to access Does Python make a copy of objects on assignment? 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