Skip to content

workshop_4_homework.md

Latest commit

 

History

History
211 lines (151 loc) · 6.68 KB

workshop_4_homework.md

File metadata and controls

211 lines (151 loc) · 6.68 KB

Workshop 4 — Homework

Welcome to your fourth homework! This time it is all Python exercises — and most of them are last week's tasks, reborn as functions. You don't solve them again; you package them.

Deadline: before Workshop 5.

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_4_homework
cd workshop_4_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 4 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, f-strings, input(), int() / float(), round(), len(), if / elif / else, and / or / not, while, for + range(), +=, .strip() / .lower() / .title() — plus this week's new material: def, parameters, return, and default values.

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

Run each file with:

python exercise_1.py

exercise_1.py — The greeting machine

Define a function greet(name) that prints a two-line greeting — the first line in Georgian (see the example run below). Give the parameter a default value of "friend". Then call the function for nino, giorgi, and mariami, and once more with no argument at all. The greeting text must exist in exactly one place in your file.

Example run:

გამარჯობა, nino!
Welcome to the course.
გამარჯობა, giorgi!
Welcome to the course.
გამარჯობა, mariami!
Welcome to the course.
გამარჯობა, friend!
Welcome to the course.

Hint: def greet(name="friend"): — defining it does nothing until you call greet("nino"). If you can fix a typo in the greeting by editing one line, you did it right.

exercise_2.py — is_even, returned

Homework 3's "even or odd", packaged. Define a function is_even(n) that returns True or False using the modulus operator (%) — no printing inside the function! Then ask the user for a number with input() + int(), and use your function in an if to print the verdict.

Example run:

Enter a number: 7
7 is odd

Hint: a comparison already is a True/False value — the whole body can be one line: return n % 2 == 0. Then write if is_even(number):.

exercise_3.py — The grade machine

Homework 3's letter grade, packaged. Define letter_grade(score) that returns "A" (90 and above), "B" (80 and above), "C" (70 and above), or "F" (anything below). Ask the user for a score and print the score together with the grade in one f-string.

Example run:

Enter your score: 83
Score 83 -> grade B

Hint: return ends the function instantly — so plain ifs work, no elif or else required. Your Workshop 3 chain is already correct: swap every print for a return.

exercise_4.py — Temperature converter

Homework 2's Celsius → Fahrenheit converter, packaged. Define to_fahrenheit(celsius) that returns the converted value rounded to 1 decimal place with round(). Read the temperature with float(input(...)) and print the result.

Example run:

Temperature in Celsius: 36.6
36.6C is 97.9F

Hint: the Workshop 2 formula was celsius * 9 / 5 + 32; wrap it: return round(celsius * 9 / 5 + 32, 1) — return the rounded value, don't print inside the function.

exercise_5.py — count_vowels

Homework 3's vowel counter, packaged. Define count_vowels(word) that loops with for char in word.lower():, counts the vowels with +=, and returns the count. Ask the user for a word and report the result.

Example run:

Enter a word: Programming
"Programming" has 3 vowels.

Hint: same chained check as last week — if char == "a" or char == "e" or char == "i" or char == "o" or char == "u": — but this time return count as the last line, outside the loop's indentation, or you'll return after the first letter.

exercise_6.py — The bouncer's brain

The club from Homework 3 is back, but this time the decision lives in a function. Define door_decision(name, age) that returns the right message — it must contain no print at all:

  • If they are younger than 18 → Sorry, no entry.
  • 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 → Welcome! Free drink for you!
  • Otherwise → Welcome!

Ask for the visitor's name and age, clean the name with .strip().lower() before calling the function, and print whatever comes back.

Example run:

What is your name?  Giorgi
How old are you? 21
Welcome! Free drink for you!

Hint: check the rules top to bottom, each branch a single return — the first one reached wins. Decision in the function, conversation outside. If your function prints, it's a display, not a brain.

exercise_7.py — Fix the silent machine (bonus)

The program below crashes. Run it, read the error message, explain in a comment why it crashes, then fix the function by changing one word so the program prints total = 115.

def add(a, b):
    print(a + b)

total = add(10, 5) + 100
print(f"{total = }")

The broken version prints 15, then crashes with TypeError: unsupported operand type(s) for +: 'NoneType' and 'int'.

Example run after the fix:

total = 115

Hint: add shows the sum but hands nothing back — a function without return returns None, and None + 100 is the crash. The 15 you saw was the display lighting up, not a value coming back.

Checklist before you submit

  • All 7 files are written and run without errors using python exercise_N.py
  • Everything is pushed inside the workshop_4_homework/ folder of your repository
  • You re-sent your repository link to the instructor

Helpful links