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Harvard CS50’s Introduction to Programming with Python — Solutions & Final Project

About

These are my solutions for Harvard CS50’s Introduction to Programming with Python (CS50P), including problem sets, unit tests for selected problems, and a final project. Most programs are small, self-contained CLI scripts.

  • Final project: Rock, Paper, Scissors & Sheldon’s Game (Big Bang Theory variant)
  • Some folders include tests runnable with pytest

Repository layout

  • final/: Final project (two games). Run: python final/project.py
  • bitcoin/: Fetches BTC price and multiplies by an amount. Run: python bitcoin/bitcoin.py 2
  • figlet/: ASCII-art text rendering with selectable fonts. Run: python figlet/figlet.py -f slant
  • emojize/: Converts aliases like ":smile:" to emoji. Run: python emojize/emojize.py
  • shirt/: Overlays a shirt image onto a photo using Pillow. Run: python shirt/shirt.py input.jpg output.jpg
  • shirtificate/: Generates a CS50 “shirtificate” PDF. Run: python shirtificate/shirtificate.py
  • pizza/: Pretty-prints a CSV as a table. Run: python pizza/pizza.py menu.csv
  • scourgify/: Cleans a CSV of names into first/last columns. Run: python scourgify/scourgify.py before.csv after.csv
  • seasons/: Prints minutes lived from a YYYY-MM-DD DOB in words. Run: python seasons/seasons.py
  • response/: Simple email validator. Run: python response/response.py
  • Many other folders (adieu/, bank/, camel/, coke/, deep/, einstein/, extensions/, faces/, game/, grocery/, indoor/, interpreter/, jar/, lines/, meal/, nutrition/, outdated/, plates/, playback/, professor/, taqueria/, tip/, twttr/, um/, watch/, working/) contain one small CLI script each. Enter the folder and run the Python file inside.

Setup

  • Ensure Python 3.10+ is installed
  • (Recommended) Create and activate a virtual environment
python -m venv .venv
source .venv/bin/activate
python -m pip install -U pip
  • Install dependencies used across exercises
python -m pip install requests emoji pyfiglet Pillow fpdf2 inflect tabulate validator-collection pytest

How to run

  • From the repository root, run individual scripts by path, for example:
python bitcoin/bitcoin.py 2
python figlet/figlet.py -f slant
python shirt/shirt.py input.jpg output.jpg
  • Many scripts read from standard input; prompts will guide you. Press Ctrl+D (or Ctrl+C) to exit where noted.

Tests

Run all tests from the repository root:

pytest -q

Run a specific test file (examples):

pytest final/test_project.py -q
pytest test_fuel/test_fuel.py -q
pytest test_twttr/test_twttr.py -q

Final project

  • Folder: final/
  • Run: python final/project.py
  • Two modes:
    • 1: Classic Rock–Paper–Scissors (first to 3 points)
    • 2: Sheldon’s Game (Rock–Paper–Scissors–Lizard–Spock, first to 3 points)
  • Exit anytime with Ctrl+D or Ctrl+C
  • Tests: pytest final/test_project.py -q
  • Demo video: YouTube

Dependencies reference

  • requests (used by bitcoin)
  • emoji (used by emojize)
  • pyfiglet (used by figlet)
  • Pillow (PIL; used by shirt)
  • fpdf2 (used by shirtificate)
  • inflect (used by seasons, adieu)
  • tabulate (used by pizza, scourgify)
  • validator-collection (used by response)
  • pytest (for tests)

Acknowledgements

Thanks to Harvard University, Prof. David J. Malan, and the CS50 staff for an excellent course.