【问题描述】模拟用钱包购买商品的行为。要求实现一个钱包报警异常类，钱包类，信用卡类以及主类，当钱包现金不够支付的时候用信用卡支付，如果信用卡也不够支付则不够买该商品 【输入形式】 主类首先输入钱包中现金数量，精确到小数点后两位 第二行输入信用卡的信用额度 第三行输入信用卡已透支的额度 第四行开始输入支付额度直到输入字符串或钱包不能支付为止为止 【输出形式】输出支付信息 【样例输入】 2000 5000 1000 500 2300 4000 【样例输出】 Cash payments:500.00,Remaining cash:1500.00,Credit card availability:4000.00 Cash payments:1500.00,Remaining cash:0.00,Credit card availability:4000.00 Credit card payments:800.00,Remaining cash:0.00,Credit card availability:3200.00 Wallet Exception,Insufficient credit card balance to pay!

好的，根据您的问题描述，我可以提供以下代码实现：

class WalletException(Exception):
    def __init__(self, message):
        super().__init__(message)
        

 Wallet:
    def __init__(self, cash):
        self.cash = cash
    
    def pay_cash(self, amount):
        if self.cash < amount:
            raise WalletException("Insufficient cash balance to pay!")
        self.cash -= amount
        print(f"Cash payments:{amount:.2f},Remaining cash:{self.cash:.2f}", end=",")
    
    def pay_credit_card(self, amount, credit_card):
        if credit_card.available_balance() < amount:
            raise WalletException("Insufficient credit card balance to pay!")
        credit_card.pay(amount)
        print(f"Credit card payments:{amount:.2f},Remaining cash:{self.cash:.2f},Credit card availability:{credit_card.available_balance():.2f}", end=",")
        

class CreditCard:
    def __init__(self, credit_limit, credit_used):
        self.credit_limit = credit_limit
        self.credit_used = credit_used
    
    def available_balance(self):
        return self.credit_limit - self.credit_used
    
    def pay(self, amount):
        if self.available_balance() < amount:
            raise WalletException("Insufficient credit card balance to pay!")
        self.credit_used += amount
    

if __name__ == "__main__":
    cash = float(input())
    credit_limit = float(input())
    credit_used = float(input())
    wallet = Wallet(cash)
    credit_card = CreditCard(credit_limit, credit_used)
    while True:
        try:
            amount = float(input())
            wallet.pay_cash(amount)
        except ValueError:
            break
        except WalletException as e:
            try:
                wallet.pay_credit_card(amount, credit_card)
            except WalletException as e:
                print(e)
                break
    else:
        print("Wallet Exception,No more payments to make!")

主要思路是使用三个类，分别是`Wallet`（钱包类）、`CreditCard`（信用卡类）和`WalletException`（钱包报警异常类）。其中，钱包类和信用卡类分别定义了现金支付和信用卡支付的方法，并在支付时进行余额判断，如余额不足则抛出钱包异常类。主程序中，先输入钱包中现金数量、信用卡的信用额度和信用卡已透支的额度，然后循环输入支付额度，直到输入字符串或钱包不能支付为止。在循环中，先尝试使用钱包支付，如余额不足则使用信用卡支付，如信用卡余额也不足则抛出钱包异常类。最后，如果循环正常结束，则输出“Wallet Exception,No more payments to make!”。