如何对重复日期行的金额进行求和？

# 假设数据存储在一个列表中，每个元素为一个字典，包含日期和金额两个字段
data = [
    {"date": "2022-01-01", "amount": 100},
    {"date": "2022-01-01", "amount": 200},
    {"date": "2022-01-02", "amount": 150},
    {"date": "2022-01-02", "amount": 250},
    {"date": "2022-01-03", "amount": 300},
]

# 创建一个字典用于存储每个日期对应的金额总和
sum_by_date = {}

# 遍历数据列表，对每个日期进行金额求和
for item in data:
    date = item["date"]
    amount = item["amount"]
    if date in sum_by_date:
        sum_by_date[date] += amount
    else:
        sum_by_date[date] = amount

# 输出每个日期对应的金额总和
for date, total_amount in sum_by_date.items():
    print(f"{date}: {total_amount}")

2022-01-01: 300
2022-01-02: 400
2022-01-03: 300