Exception Handling Example-2

Example 1:

Let's take an example of bank transactions. We are having multiple custom exceptions.

1) Assume, user's bank account must contain at least 100$. While transaction, if remaining balance goes below 100$, an Exception should be generated.

2) User should do maximum 3 attempts. If user tries for fourth attempt, an exception should be generated and bank account should get freezed.

I will solve the 1st one, 2nd case is your challenge.

#step-1: Create user-defined Exception class
class BalanceException(Exception):
	pass

#step-2:raise Exception for particular condition
balance = 1000  
try:
	amt = float(input("Enter the amount to withdraw:"))
	#check remaining amount after transaction
	temp = balance - amt
	if temp < 100:
		raise BalanceException("Insufficient balance")
except Exception as obj:
	print(obj)

In above snippet, we raised a custom exception if balance goes below 100$.

We want to do transaction if no exception has occurred. We can write else block.

else:
	balance = balance - amt

Weather exception occurs or not, we want to print remaining balance. We can use finally block for that.

finally:
	print("Remaining balance is:",balance)

Now, add another Exception for second case and update code given.