Class creation


Hi guys, can somebody help me to solve this python problem

Create a class called BankAccount
• Create a constructor that takes in an integer and assigns this to a balance property.
• Create a method called deposit that takes in cash deposit amount and updates the balance accordingly.
• Create a method called withdraw that takes in cash withdrawal amount and updates the balance accordingly. if amount is greater than balance return "invalid transaction"
• Create a subclass MinimumBalanceAccount of the BankAccount class

import unittest
class AccountBalanceTestCases(unittest.TestCase):
def setUp(self):
self.my_account = BankAccount(90)

def test_balance(self):
self.assertEqual(self.my_account.balance, 90, msg=‘Account Balance Invalid’)

def test_deposit(self):
self.assertEqual(self.my_account.balance, 180, msg=‘Deposit method inaccurate’)

def test_withdraw(self):
self.assertEqual(self.my_account.balance, 50, msg=‘Withdraw method inaccurate’)

def test_invalid_operation(self):
self.assertEqual(self.my_account.withdraw(1000), “invalid transaction”, msg=‘Invalid transaction’)

def test_sub_class(self):
self.assertTrue(issubclass(MinimumBalanceAccount, BankAccount), msg=‘No true subclass of BankAccount’)