Types of Exceptions

Lesson 10 of 16 in Coddy's Exception Handling in Python course.

There are two types of Exceptions:

Built-in Exceptions:

These Exceptions are already available in python.
ex. EOFError, IndexError, TypeError, ValueError etc

User-defined Exceptions (Custom Exceptions):

These are created by programmers.
ex. Raising Exception if user enters invalid password.

Remember:

Every Exception is actually a class in Python inherited from 'BaseException' built in class.
So, IndexError is also built-in class inherited from BaseException class.
As soon as exception occurs, an object is created for raised Exception.

Challenge

Easy

Click on RUN CODE and you will see the IndexError Inheritance hierarchy.

Try it yourself

#Click on RUN CODE and observe
def observe(idx):
    try:
        data = [10,20,30,40]
        print(data[idx])  #IndexError
    except Exception as e:
        print(type(e)) #Shows Exception is class
        print(IndexError.mro()) #Shows all parent classes

All lessons in Exception Handling in Python

1Introduction to Exceptions

What is Exception ?Exception vs Error

4Customization/best practices

Customize Tracebacks

2Exception Handling

try-except else Finally Printing Exception message Printing Exception Name Handling Multiple Exceptions sys module for information

3User-defined Exceptions

Types of ExceptionsRaising an Exception User Defined Exception Exception Handling Exercise- 1 Exception Handling Example-2 Exception Handling Example-3