✅ Quiz 05 — Your First Code
Answer in your head or on paper first, then open the fold. If you get one wrong, that’s the quiz working — reread that section and it will stick twice as hard.
1. Why does this course start with Python rather than another programming language?
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Because Python reads almost like English, so beginners can concentrate on the ideas instead of the punctuation — and because it's a serious professional language (used at NASA, Netflix, banks, and science labs), so nothing you learn is wasted.2. What will this line show on the screen: print("2 + 2") — and why isn’t it 4?
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It shows exactly `2 + 2`. The quotation marks make it a string — text to display as-is, not math to work out. Without the quotes, `print(2 + 2)` would show `4`.3. In plain English, what happens when Python runs score = 10? What does the = mean here?
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Python creates (or reuses) a jar labeled `score` and stores the value 10 inside it. The `=` means "store the thing on the right in the variable on the left" — an action, not a math statement of equality.4. A variable is like a labeled jar. Name one way real jars and variables behave differently.
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When you put a new value into a variable, the old value is gone completely — unlike a real jar, where the old contents end up somewhere. (Also acceptable: a variable's contents are replaced instantly; you can't have a "half-emptied" variable.)5. What’s the difference between 5 and "5" in Python? What is "5" + "5"?
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`5` is a number — you can do math with it. `"5"` is a string — a piece of text that happens to look like a digit. `"5" + "5"` is `"55"`, because `+` on strings glues them together instead of adding.6. What does input() do, and what type of value does it always hand back — even if the user types 42?
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`input()` pauses the program, waits for the person to type something and press Enter, then hands back what they typed. It always hands back a **string** — so a typed `42` arrives as `"42"`, and you need `int(...)` to turn it into a number before doing math or comparisons with it.7. Read this code. What prints when age is 16? And when it’s 70?
if age >= 65:
print("Senior ticket")
elif age >= 18:
print("Adult ticket")
else:
print("Child ticket")
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With 16: `Child ticket` — both checks fail, so the `else` catch-all runs. With 70: `Senior ticket` — the first check passes, and Python skips the rest entirely (even though 70 is also ≥ 18, only the first passing branch runs).8. Your friend wants a program that prints one thank-you message per person on their 30-name guest list. Which loop fits better, for or while — and why?
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`for` — you have a collection (the basket of 30 names) and want the loop to run once per item. `while` is for "repeat until some condition changes," when you don't know the number of repeats in advance (like "keep asking until the password is right").9. What is an infinite loop, and what everyday-kitchen mistake in a while loop causes one?
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A loop whose condition never becomes false, so it repeats forever. It happens when nothing inside the loop changes the condition — like the countdown loop without the `countdown = countdown - 1` line: the jar stays at 5 forever, and "is it more than 0?" is always yes. In kitchen terms: "stir until thick" when you never actually check, or when nothing you do could ever make it thick.10. You run your program and get: NameError: name 'naem' is not defined pointing at line 4. What is the computer telling you, and what’s probably wrong?
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The pedantic proofreader is saying: "On line 4 you asked me to open a jar labeled `naem`, and no such jar exists." Almost certainly you created a variable called `name` earlier and misspelled it as `naem` on line 4. Error messages usually name the line and the problem — reading them is half of debugging.11. True or false: after this module you could build a simple version of Instagram, since it’s mostly code like this but longer.
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False — and this course won't pretend otherwise. Real apps need screens, databases, servers, and usually teams (Parts 3–5 of this course explain all of it). What you genuinely *can* work toward now: small programs that automate boring chores — renaming files, adding up expenses, quizzing your kids. That's real, useful programming, and it's how nearly every professional started.12. 🗣️ Explain it to a friend
A friend watches over your shoulder as you run the rocket countdown program, and asks: “Wait — how does the computer know to stop at zero?” Explain it out loud in two or three sentences, using the words variable and loop.