Python while Loops Explained: break, continue & Input Validation
Some tasks need to run an unknown number of times — until a user enters valid input, until a menu choice says quit, until a condition is met. That's where the while loop comes in, and for loops simply can't do it.
This lesson explains how while loops work, diagnoses the three root causes of infinite loops (the most common while bug), and introduces break and continue as flow controllers. You'll learn the idiomatic while True pattern and build three core blueprints: an input validation pipeline, a menu-driven dispatch system, and an accumulator engine for running totals — then combine them into a complete interactive order-entry program.
Includes an architectural reference card.
📄 Full written lesson, code examples & exercises → https://markumreed.github.io/ism3232/...
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