用Python写一个账单信息管理系统，里面有收入支出，修改账单，查询账单，显示余额，退出系统

在Python中编写一个简单的账单信息管理系统可以采用类结构来组织，下面是一个基本的设计框架：

class AccountManager:
    def __init__(self):
        self.incomes = []
        self.expenses = []

    # 添加收入
    def add_income(self, amount, description=""):
        self.incomes.append({"amount": amount, "description": description})

    # 添加支出
    def add_expense(self, amount, description=""):
        self.expenses.append({"amount": -amount, "description": description})

    # 修改账单（这里假设我们有唯一的标识符）
    def update_bill(self, identifier, new_amount=None, new_description=None):
        for i, bill in enumerate(self.incomes if amount > 0 else self.expenses):
            if bill["identifier"] == identifier:
                if new_amount is not None:
                    bill["amount"] = new_amount
                if new_description is not None:
                    bill["description"] = new_description
                break

    # 查询账单
    def query_bill(self, identifier):
        incomes = [bill for bill in self.incomes if bill["identifier"] == identifier]
        expenses = [bill for bill in self.expenses if bill["identifier"] == identifier]
        return {"incomes": incomes, "expenses": expenses}

    # 显示余额
    def show_balance(self):
        total = sum(income["amount"] for income in self.incomes) - sum(expense["amount"] for expense in self.expenses)
        return f"当前余额: {total}元"

    # 退出系统
    def exit_system(self):
        print("感谢使用账单管理器，再见！")
        return True


# 示例用法
manager = AccountManager()
manager.add_income(5000, "工资")
manager.add_expense(2000, "购物")
print(manager.show_balance())  # 输出当前余额
identifier = "工资"
query_result = manager.query_bill(identifier)
# 更改账单描述
manager.update_bill(identifier, new_description="本月奖金")