在Python中从已排序的事务列表计算余额

transactions = [
    {"date": "2022-01-01", "amount": 100, "type": "income"},
    {"date": "2022-01-02", "amount": 50, "type": "expense"},
    {"date": "2022-01-03", "amount": 200, "type": "income"},
    {"date": "2022-01-04", "amount": 80, "type": "expense"}
]

balance = 0

for transaction in transactions:
    if transaction["type"] == "income":
        balance += transaction["amount"]
    elif transaction["type"] == "expense":
        balance -= transaction["amount"]

print("余额：", balance)