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STUDENT NOTES · DAY 12 OF 24
Locked Boxes & the No-Repeats Club 🔒
Two special containers: the tuple (a list that can NEVER change) and the set (a club that refuses duplicates).
1Tuples — sealed at birth
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Py: Round brackets make a tuple. Read it, loop it, index it — but change it? Never. Perfect for things that must stay fixed, like GPS coordinates.
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Bugly: Try to edit one… hehehe:
2The one-item tuple trap
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Professor Hoot: (5) is just the number 5 wearing brackets. The COMMA makes the tuple: (5,). Tiny comma, big difference.
3Sets — the no-duplicates club
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Bittu: I check membership in a set at lightning speed — in is my favourite word.
4Set tricks
5Quick quiz! 🧠
t = (1, 2, 3); t[0] = 9 — what happens?
💡 Tuples are immutable. Once made, forever sealed.
What is len({1, 2, 2, 3, 3, 3})?
💡 The set bounces duplicates at the door: only {1, 2, 3} get in.
6Your mission 🚀
Mission 1: Store your birthday as a tuple (day, month, year). Try changing it — read the error like a pro.
Mission 2: Make a set from the list [1,2,2,3,3,3,4] and print how many UNIQUE numbers there are.
Mission 3: Use set("your own name") to find your unique letters!
Day 12 done — halfway through the course! 🎉
Next: files — teach your programs to REMEMBER after they close.
Go to Day 13: Files →