I have a diamond inheritance scenario. The two middle classes inherit okay, but the Combo class, I can't quite figure out. I want the Combo class to inherit all attributes with the overridden methods coming from the Loan class.
I can't figure out how to write the constructor for the Combo class.
This is the database, the data is coming from:
Business Rules:
- One customer can have zero or many accounts
- One account belongs to one customer
- One account is optionally a loan account
- One loan account is one account
- One account is optionally a transaction account
- One transaction account is one account
An account can be both a loan account and a transaction account
The combo account means the loan account has a card attached and is also the transaction account.
And this is the class diagram:
class Account:
def __init__(self, account_id, customer_id, balance, interest_rate):
self.account_id = account_id
self.customer_id = customer_id
self.balance = float(balance)
self.interest_rate = float(interest_rate)
def deposit(self):
try:
amount = float(input('Enter deposit amount: '))
self.balance = self.balance + amount
print('Account Number:', self.account_id)
print('Deposit Amount:', amount)
print('Closing Balance:', self.balance)
print('Deposit successful.\n')
return True
except ValueError as e:
print('Error: please enter a valid amount.\n')
return False
def withdraw(self):
try:
amount = float(input('Enter withdrawal amount: '))
if amount > self.balance:
print('Account Number: ', self.account_id)
print('Withdrawal Amount: ', amount)
print('Account Balance: ', self.balance)
print('Error: withdrawal amount greater than balance.\n')
return False
else:
self.bal = self.balance - amount
print('Account Number: ', self.account_id)
print('Withdraw Amount: ', amount)
print('Closing Balance: ', self.balance)
print('Withdrawal Successful.\n')
return True
except ValueError as e:
print('Error: please enter a valid amount.\n')
return False
def __str__(self):
return (f'\nAccount Number: {self.account_id}\n'
f'Balance: {self.balance:.2f}\n'
f'Interest Rate: {self.interest_rate:.2f}\n')
class Transaction(Account):
def __init__(self, account_id, customer_id, balance, interest_rate, card_no, cvn, pin):
super().__init__(account_id, customer_id, balance, interest_rate)
self.card_no = card_no
self.cvn = cvn
self.pin = pin
class Loan(Account):
def __init__(self, account_id, customer_id, balance, interest_rate, duration, frequency, payment, limit):
super().__init__(account_id, customer_id, balance, interest_rate)
self.duration = int(duration)
self.frequency = frequency
self.payment = float(payment)
self.limit = float(limit)
# override inherited method
def withdraw(self):
try:
amount = float(input('Enter withdrawal amount: '))
if self.balance - amount < self.limit:
print('Account Number: ', self.account_id)
print('Withdrawal Amount: ', amount)
print('Account Balance: ', self.balance)
print('Error: withdrawal amount greater than limit.\n')
return False
else:
self.balance = self.balance - amount
print('Account Number: ', self.account_id)
print('Withdraw Amount: ', amount)
print('Closing Balance: ', self.balance)
print('Withdrawal Successful.\n')
return True
except ValueError as e:
print('Error: please enter a valid amount.\n')
return False
def __str__(self):
return super().__str__() + (f'Duration: {self.account_id} years\n'
f'Payment Frequency: {self.frequency}\n'
f'Limit: {self.limit:.2f}\n')
class Combo(Loan, Transaction):
def __init__(self, account_id, customer_id, balance, interest_rate, duration, frequency, payment, limit, card_no, cvn, pin):
# what goes here?
Test Data...
from account import Account, Transaction, Loan, Combo
account_id = '1'
customer_id = '1'
balance = 0
interest_rate = 0.06
duration = 20
frequency = 'week'
payment = 500
limit = 500000
card_no = '5274728372688376'
cvn = '234'
pin = '9876'
loan = Loan(account_id, customer_id, balance, interest_rate, duration, frequency, payment, limit)
print(loan)
transaction = Transaction(account_id, customer_id, balance, interest_rate, card_no, cvn, pin)
print(transaction)
# whatever I do, it fails here
combo = Combo(account_id, customer_id, balance, interest_rate, duration, frequency, payment, limit, card_no, cvn, pin)
print(combo)
