Union de dictionnaires

Écrire une fonction union qui prend en paramètres deux dictionnaires d1 et d2, dont les valeurs associées aux clés sont des nombres, et qui renvoie un dictionnaire d défini ainsi:

les clés de d sont celles de d1 et d2 réunies;
la valeur associée à une clé dans le dictionnaire d est la somme de ses valeurs associées dans les dictionnaires d1 et d2 si la clé est présente dans ces deux dictionnaires et sinon la valeur associée dans le dictionnaire où elle est présente.

Exemples

🐍 Console Python

>>> union({1: 4, 2: 3}, {1: 5, 3: 7})
{1: 9, 2: 3, 3: 7}
>>> union({}, {'a': 7, 'b': 5})
{'a': 7, 'b': 5}
>>> union({'a': 7, 'b': 5}, {})
{'a': 7, 'b': 5}
>>> union({'Aya': 15, 'Edith': 12}, {'Edith': 15, 'Aya': 12})
{'Aya': 27, 'Edith': 27}

Évaluations restantes : 10/10

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