def transfer(self, amount: float, receiver_account: 'Account'):
        """Transfer money from one account to another."""
        if amount <= 0:
            raise TransactionError("Amount is lower or equal to 0")
        elif self._balance < amount:
            raise TransactionError("Amount is lower or equal to 0")
        elif receiver_account.bank != self.bank and self._balance < amount + 5:
            raise TransactionError("Amount is lower than 5 or not enough money")
        elif self == receiver_account:
            raise TransactionError("The bank is the same")
        else:
            transaction = Transaction(-amount, datetime.date.today(), self, receiver_account, False)
            self.transactions.append(transaction)
            self.bank.transactions.append(transaction)
        if receiver_account.bank != self.bank:
            self.withdraw(5, False)
            receiver_account.deposit(amount, False)
            receiver_account.bank.transactions.append(transaction)
        receiver_account.transactions.append(transaction)
        self.withdraw(amount, False)
        receiver_account._balance += amount