test

class Account:

    def __init__(self):
        self.balance = 0

    def __repr__(self):
        return f'<Account: {self.balance}>'

In [2]: from account import Account

In [3]: a = Account()

In [4]: a
Out[4]: <Account: 0>


class Account:

    def __init__(self):
        self.transactions = []

    def __repr__(self):
        return f'<Account: {self.balance}>

class Account:

    def __init__(self):
        self.transactions = []

    def deposit(self, amount):
        transaction = ('deposit', amount)
        self.transactions.append(transaction)

    def __repr__(self):
        return f'<Account: {self.balance}>'


class Account:

    def __init__(self):
        self.transactions = []

    def deposit(self, amount):
        transaction = ('deposit', amount)
        self.transactions.append(transaction)

    def withdraw(self, amount):
        transaction = ('withdraw', amount)
        self.transactions.append(transaction)

    def __repr__(self):
        return f'<Account: {len(self.transactions)}>'

In [4]: a.transactions
Out[4]: []

In [5]: a.deposit(10)

In [6]: a.transactions
Out[6]: [('deposit', 10)]