我正在使用 OOPS 概念使用银行 class 进行存款和取款。 但它显示语法错误

Question

class Bank:
    def __init__(self,owner,balance):
        self.owner = owner
        self.balance = balance
    def __str__(self):
        return f"Bank owner:{self.owner}\n Bank balance:{self.balance}"
    def deposit(self,amount):
        self.amount = amount
        print('Deposit accepted')
        return self.balance += self.amount
    def withrawl (self,amount):
        if self.amount>self.balance:
            print('Withdrawl exceeded the available balance')
        else:
            return self.balance -= self.amount
            print('Withdrawl accepted')

Answer 1

In-place operators like += and -= cannot be used in a return statement. Modify the value first, then return it. Also, the last print statement is unreachable.

class Bank:
    def __init__(self, owner, balance):
        self.owner = owner
        self.balance = balance

    def __str__(self):
        return f"Bank owner:{self.owner}\n Bank balance:{self.balance}"

    def deposit(self, amount):
        print('Deposit accepted')
        self.balance += amount
        return self.balance

    def withdrawl(self, amount):
        if amount > self.balance:
            print('Withdrawl exceeded the available balance')
        else:
            self.balance -= amount
            print('Withdrawl accepted')
            return self.balance