dictionary Bersarang

students = {
    "Alice": {"age": 20, "grade": "A"},
    "Bob": {"age": 22, "grade": "B"}
}

# Mengakses nilai bertingkat
print(students["Alice"]["age"])  # output: 20

# Menambahkan pasangan kunci-nilai baru ke dictionary bertingkat
students["Alice"]["major"] = "Math"
print(students["Alice"])  # output: {'age': 20, 'grade': 'A', 'major': 'Math'}