Day 3 Python Modulo (%) Explained: Odd/Even Check + Real Examples

Описание: “Stop guessing remainders—learn how % really works and build an odd/even checker in minutes!”

Welcome to Day 3 — Introducing the Modulo (%).
In this quick, beginner-friendly lesson, you’ll understand what the modulo operator does (it returns the remainder of a division) and why it’s super useful in real code.

What you’ll learn

✅ What % returns and how to read a % b

✅ Why 10 % 5 == 0 but 10 % 3 == 1 (clear visual reasoning)

✅ Build an Odd/Even checker using % 2

✅ When to use modulo in problems like cycles, wrapping, scheduling, hashing

✅ Common mistakes & gotchas (strings vs ints, negative numbers note)

Create a Python Odd/Even Checker:

Take input → convert to int → if n % 2 == 0: even else odd.
Perfect exercise for #100DaysOfCode or your first utility scripts.

👍 Like if this helped, 🔔 Subscribe for the full Day-by-Day Python series, and comment “Modulo mastered!” if you got the challenge working.

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