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scores = {"Alice": 95, "Bob": 78, "Carol": 88} for name, score in scores.items(): grade = "A" if score >= 90 else "B" if score >= 80 else "C" print(f"{name}: {score} ({grade})") scores.setdefault("Dave", 0) scores["Alice"] = scores.get("Alice", 0) + 5 print(scores)
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