Reading Errors and Debugging

Easy

Tracebacks, try and except, off-by-one errors, is versus ==, and the string-that-looks-like-a-number problem that every dataset produces.

Learning Objectives

→Read a traceback from the bottom up and find the failing line
→Catch a specific exception instead of swallowing everything
→Find an off-by-one error by tracing a loop on two items
→Choose between is, == and a truthiness check, and know when 0 breaks the wrong one
→Convert text to numbers, and recognise concatenation happening where addition was meant

Reading a Traceback

~9 min· Intro

Catching Errors with try / except

~10 min· Easy

The Off-by-One Loop

~9 min· Easy

Comparing Values: == and is

~9 min· Easy

Type Errors: Text That Looks Like a Number

~9 min· Easy

Optional multiple-choice questions on the ideas behind this section. Most useful after you have tried the coding problems above.