Minha forma de resolução

from abc import ABCMeta, abstractmethod


class Account(metaclass=ABCMeta):

    def __init__(self, number, name, age):
        self.number =  number
        self.name = name
        self.age = age
        self._balance = 0

    def deposit(self, value):
        self._balance += value

    @abstractmethod
    def month_pass(self):
        pass

    @property
    def balance(self):
        return self._balance

    def __str__(self):
        return f'Conta:{self.number:05d}-{self.name}, Saldo:{self.balance:.2f}'

    def __eq__(self, other):
        return self.number == other.number and isinstance(self, type(other))

class CurrentAccount(Account):

    def month_pass(self):
        self._balance -= 2


class SavingAccount(Account):

    def month_pass(self):
        self._balance *= 1.01
        self._balance -= 3


account_luccas = (CurrentAccount(1,'Luccas',27), SavingAccount(1,'Luccas',27))
account_luccas[0].deposit(100)
account_luccas[1].deposit(100)
for account in account_luccas:
    print(account)
    account.month_pass()
    print(account)

print(account_luccas[0] == account_luccas[1])