Module 12: Exceptions

Recognize the built-in exceptions Python raises and handle them with try and except.

Exam	PCEP-30-03
Section	4. Functions and Exceptions (20% of the exam)
Objectives	4.2.1 and 4.2.2
Exam questions	About 2, one per objective

By the end of this module you can do everything below. The objectives and their wording come from the official PCEP-30-03 syllabus.

4.2.1 Explain and recognize basic Python exceptions

• Explain the purpose of exceptions in Python programs.
• Explain how an exception interrupts the flow of program execution.
• Recognize common situations in which Python raises exceptions.
• Recognize basic built-in exceptions, including ValueError, TypeError, ZeroDivisionError, IndexError, KeyError, and NameError.
• Relate common exception types to the operations that may cause them.

4.2.2 Handle runtime exceptions with try and except

• Use try and except to handle runtime exceptions.
• Handle specific exception types using one or more except branches.
• Use multiple except branches to handle different exception types.
• Trace simple exception-handling flow when an exception occurs or does not occur.