How to Implement the Repository Pattern in Python with an In-Memory Dict

class UserRepository:
    def __init__(self):
        self._storage = {}
        self._next_id = 1

    def create(self, name, email):
        user_id = self._next_id
        self._next_id += 1
        self._storage[user_id] = {"id": user_id, "name": name, "email": email}
        return self._storage[user_id]

    def get(self, user_id):
        return self._storage.get(user_id)

    def get_all(self):
        return list(self._storage.values())

    def update(self, user_id, name=None, email=None):
        if user_id not in self._storage:
            return None
        user = self._storage[user_id]
        if name is not None:
            user["name"] = name
        if email is not None:
            user["email"] = email
        return user

    def delete(self, user_id):
        return self._storage.pop(user_id, None)


if __name__ == "__main__":
    repo = UserRepository()
    repo.create("Alice", "alice@example.com")
    repo.create("Bob", "bob@example.com")

    updated = repo.update(1, name="Alice Smith")
    deleted = repo.delete(2)

    print("All users:", repo.get_all())
    print("User 1:", repo.get(1))
    print("User 2 after delete:", repo.get(2))
    print("Deleted user:", deleted)