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STUDENT NOTES · DAY 5 OF 24
The Repeat Machine 🔁
Why type something 100 times when Bittu can repeat it for you? Today: for loops, while loops, and the mighty break.
1The for loop — repeat a fixed number of times
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Py: A for loop is like roll-call: go through the numbers one by one, do the same thing for each.
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Professor Hoot: range(1, 6) gives 1,2,3,4,5 — the end number is never included. It's shy.
Range visualizer — slide the end number!
range(5)
0 1 2 3 4
2Loops do real work
Remember writing multiplication tables in a notebook? Two lines of Python:
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Bittu: Table of 7 in 0.0001 seconds. Ask me for the table of 40404 — I don't care.
3The while loop — repeat UNTIL something changes
A while loop doesn't count — it keeps going as long as its test stays True:
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Bugly: Hehehe… forget the count = count - 1 line and the loop runs FOREVER. My favourite trap! (Press the stop ■ button in Colab if it happens.)
4break — the emergency exit
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Py: while True loops forever on purpose — until break smashes the exit. Every game loop ever is built like this.
5Quick quiz! 🧠
What is the LAST number printed by for i in range(1, 6): print(i)?
💡 range(1, 6) stops BEFORE 6. Prints 1,2,3,4,5.
A while loop's test never becomes False. What happens?
💡 Nothing stops it! Something inside the loop must change, or you meet the infinite loop.
6Your mission 🚀
Mission 1: Print your name 10 times with a for loop.
Mission 2: Print the table of any number the user types (input + int + loop).
Mission 3: Make a countdown from 10 to 1 that ends with "🚀 LIFTOFF!".
Day 5 done — you command the Repeat Machine! 🔁
Next: loops inside loops, skipping with continue, and star pyramids.
Go to Day 6: Loop Tricks →