How come I get an error message?

Question

My code is:

class Bank:
    def __init__(self):
        self.balance = 0


    def deposit(self, mon):
        self.balance += mon
        return self.balance


    def withdraw(self, mon):
        self.balance -= mon
        return self.balance


    def balance(self):
        return self.balance


    def take_out_all(self):
        if self.balance > 0:
            self.balance -= self.balance
            return self.balance
        else:
            return "You can only take out all of your money if you have a POSITIVE amount of money"


    def deposit_100(self):
        self.balance += 100
        return self.balance


    def withdraw_100(self):
        self.balance -= 100
        return self.balance

But when I use Bank.balance(), I get an error that says:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'int' object is not callable

Answer 1 · 2018-06-18T23:01:37Z

June 18, 2018 11:01pm

I see a couple of issues here. First, you have a property named "balance" where you store a value, but then you also have a method with that same name. When you create a new instance, the method gets overwritten by the property. To avoid such confusion, always give methods and properties different names.

Also, since "Bank" is the class name, it would not be a good name for an instance. And if it's not an instance, "Bank.balance()" would not be valid because it's not a class method.

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Jack Cummins

Jack Cummins

How come I get an error message?

1 Answer

Steven Parker

Steven Parker