Abstract

Try/except are a construct in Python used to catch a potential exception. Sometimes things go wrong in your code! Or in someone else's code in a module. Sometimes some errors might be expected like when you try and read a user supplied file, maybe it isn't available because they've specified the wrong path.

About This Material

This is a Hands-on Tutorial from the GTN which is usable either for individual self-study, or as a teaching material in a classroom.

Questions this will address

• How do I try to execute code, knowing it might fail?
• What are some situations where this is important?
• How can I write my own exceptions.

Learning Objectives

• catch an exception
• raise your own exception