第 3 章：列表、字典与数据处理 — 整理你的数据抽屉¶

expenses = [12.5, 8, 35.2]
expenses.append(16)

for amount in expenses:
    print(f"支出：{amount:.2f} 元")

print(f"合计：{sum(expenses):.2f} 元")

record = {
    "title": "午餐",
    "amount": 25.0,
    "category": "餐饮",
}

print(record["title"])

records = [
    {"title": "午餐", "amount": 25.0, "category": "餐饮"},
    {"title": "地铁", "amount": 3.0, "category": "交通"},
]

food_total = sum(
    item["amount"] for item in records if item["category"] == "餐饮"
)
print(food_total)