CBSE Class 12 Computer Science – Exception Handling in Python

Chapter Overview

This chapter introduces Exception Handling in Python, a mechanism to catch and manage runtime errors gracefully. Instead of terminating the program abruptly, exception handling provides a controlled way of managing errors. Students will learn built-in exceptions, use of try-except blocks, else and finally clauses, raising exceptions, and creating user-defined exceptions for better program reliability.

Important Keywords

• Exception: An error that occurs during execution, disrupting normal flow.
• try: Block that encloses the code which may raise an exception.
• except: Block that handles exceptions raised in try block.
• else: Block executed if no exceptions occur in try block.
• finally: Block that always executes, regardless of exception.
• raise: Keyword used to raise an exception manually.
• User-defined Exception: Custom exception class defined by the programmer.