User Defined Exception

How to Create User-Defined Exception?:

There are three steps:

1. Create Exception class by inheriting 'Exception' class.

2. Raise Created Exception `for particular condition.

3. Handle that Exception.

Q. Suppose I want to avoid 'division by five' in my program. I want an Exception to be generated if user tries to divide by 5.

#step-1: Creating Exception class
class FiveDivisionError(Exception):
	pass

FiveDivisionError is an Exception created by us. You can create constructor as well and configure message. But, we will configure message in raise statement.

#step-2: raise an Exception for particular condition
try:
	a = int(input("1st Number:"))
	b = int(input("2nd Number:"))
	if b == 5:
		raise FiveDivisionError("Cannot divide by five")
	div = a/b
	print("Division:",div)

In above snippet, we raised FiveDivisionError if b == 5 condition satisfies. We used try block to handle Exception.

#step-3: Handle Exception using except
except Exception as obj:
	print(obj)

Above snippet will handle Exception occurred. Now, it's your turn to solve one more problem.