Python Program for Raising User Generated Exception

Program to illustrate raising user generated Exception in Python

# Python program to illustrate 
# raising user generated Exception in python

# class to create user generated Exception...
class AgeError(Exception):
    def __init__(self,message="Age must be greater than 0"):
        self.__errormessage=message
    def __str__(self):
        return(self.__errormessage)

# Try block 
try:
    age = int(input("Enter Age : "))
    if age<=0:
        # raise AgeError()
        raise AgeError("Age must be greater than zero")
    else:
        if age>=18:
            print("You are eligible to Vote")
        else:
            print("You are not eligible to Vote")

# except Block             
except AgeError as ex:
    print(ex)

Output:

Run 1: 
Enter Age : 43
You are eligible to Vote

Run 2: 
Enter Age : 12
You are not eligible to Vote

Run 3: 
Enter Age : -4
Age must be greater than zero

Explanation:

In the above code, we have created a class AgeError that inherits exceptions for creating and throwing user generated exceptions. The exception is thrown when a user enters a value 0 or less otherwise normal flow of code goes on. The code checks for eligibility of a person to vote.