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Workshop 3 — Homework

Welcome to your third homework! This time it is all Python exercises — no research questions.

Deadline: before Workshop 4.

How to submit: push everything to the same GitHub repository you used for the previous homeworks, then re-send the repository link to your instructor.

Put this homework in its own folder so it does not mix with the earlier ones:

cd python-homework        # the repo from Homework 1
mkdir workshop_3_homework
cd workshop_3_homework
# ...create your exercise files in here...

When you are done, commit and push from the repository folder:

git add .
git commit -m "Add workshop 3 homework"
git push

If a command fails, read the error message carefully — it usually tells you what is wrong. If you are still stuck, take a screenshot and bring it to the next workshop.

Python exercises

Create the files below and write Python code to solve each task. Use only what we have covered so far: variables, type casting, operators, input(), string methods, f-strings, and the new Workshop 3 tools — if / elif / else, the boolean operators and / or / not, while and for loops, range(), looping over the characters of a string, len(), and the shortcuts += / -=.

We have not learned functions or lists yet — you do not need them. Keep your solutions to the tools above.

Run each file with:

python exercise_1.py

exercise_1.py — Even or odd

Ask the user for a whole number and cast it to an int. Using if / else and the modulus operator (%), print a full sentence saying whether it is even or odd.

Example run:

Give me a number:
7
7 is odd.

exercise_2.py — Letter grade

Ask the user for a score (an int from 0 to 100). Using an if / elif / else chain, print the letter grade:

  • 90 and above → A
  • 80–89 → B
  • 70–79 → C
  • anything below 70 → F

Example run:

Your score:
84
Your grade is B

exercise_3.py — Countdown

Ask the user for a starting number n and cast it to an int. Using a while loop and -=, count down and print every number from n down to 1. When the loop is finished, print Liftoff!.

Example run:

Count down from:
3
3
2
1
Liftoff!

exercise_4.py — Add them all up

Ask the user for a number n. Using a for loop, range(), and a total variable that you grow with +=, add up every number from 1 to n and print the result.

Example run:

Add up to:
5
The sum of 1 to 5 is 15

Hint: range(1, n + 1) gives you the numbers 1, 2, ... , n. Start with total = 0 before the loop.

exercise_5.py — Count the vowels

Ask the user for a word. Clean it with .strip().lower(). Then loop over the word one character at a time and count how many letters are vowels (a, e, i, o, u). Use a counter and +=, and decide "is this a vowel?" with the or operator. At the end, print the count, and also print how many letters the whole word has using len().

Example run:

Type a word:
Programming
"programming" has 3 vowels out of 11 letters.

Hint: inside the loop you are checking one character, e.g. if char == "a" or char == "e" or ...:

exercise_6.py — Club entry

A club has these rules. Ask for the visitor's age (cast to int) and name (cleaned with .strip().lower()), then use if / elif / else together with and, or, and not to print the right message:

  • If they are younger than 18 → Sorry, you cannot enter.
  • Otherwise, if they are at least 21 and their name is nino → Welcome, VIP!
  • Otherwise, if their age is even or their name is giorgi → You get a free drink!
  • Otherwise → Welcome in. Enjoy your evening.

Example run:

How old are you?
24
What is your name?
  Giorgi
You get a free drink!

exercise_7.py — Fix the loop (bonus)

The program below is meant to count down from 5 to 1, but it never stops — it prints 5 forever. Explain in a comment why it loops forever, then fix it.

n = 5
while n > 0:
    print(n)
    n += 1

Hint: look closely at the line that changes n. Is the number getting closer to 0, or further away? If you run this by accident, stop it with Ctrl + C.

Checklist before you submit

  • exercise_1.py … exercise_7.py written and runnable
  • Everything pushed to your GitHub repository (inside a workshop_3_homework/ folder)
  • Repository link sent to the instructor

Helpful links