Coffee Machine

A console game from Udemy's 100 Days of Code: The Complete Python Pro Bootcamp (day 15). A virtual coffee machine serves espresso, latte and cappuccino. Pay with US coins (quarters, dimes, nickels and pennies). The machine checks its water, milk and coffee before it serves, refunds you if you pay too little and gives change if you pay too much.

What would you like? (espresso/latte/cappuccino): latte
Please insert coins.
How many quarters?: 10
How many dimes?: 0
How many nickels?: 0
How many pennies?: 0
Here is your latte. Enjoy!

• Python 3.13 or newer, no runtime dependencies.
• Type report to see the water, milk, coffee and money in the machine, and off to switch the machine off.
• The function names follow the assignment: is_resource_sufficient, process_coins, is_transaction_successful, make_coffee.
• Money is counted in whole cents inside the program, so change is never off by a rounding error.

Requirements

• Python 3.13 or newer
• Optional: Doxygen to build the source documentation

Set up

Create a local virtual environment in .venv, activate it, and upgrade pip.

Windows (PowerShell):

python -m venv .venv
.venv\Scripts\Activate.ps1
python -m pip install --upgrade pip

Windows (Git Bash), Linux and macOS:

python -m venv .venv
source .venv/Scripts/activate   # Linux/macOS: source .venv/bin/activate
python -m pip install --upgrade pip

The machine itself needs nothing more. To run the tests and the code checks, install the development tools:

python -m pip install -e ".[dev]"

Run the coffee machine

python -m coffee_machine

Type espresso, latte or cappuccino and press Enter, then enter the coins. Type report for the machine's resources, or off to quit.

Run the tests

python -m pytest

Check the code style and types:

python -m ruff check src tests
python -m ruff format --check src tests
python -m mypy src tests

Build the source documentation

The source uses Doxygen comments. The HTML output goes to docs/doxygen/html.

doxygen Doxyfile

Project layout

Path	Content
src/coffee_machine/	The machine: main.py (the loop), constants.py (menu, coins, starting resources)
tests/	pytest tests
docs/	Planning and review documents (business case, plan, milestones)
pyproject.toml	Project configuration
Doxyfile	Doxygen configuration

License

GNU Affero General Public License v3.0. See LICENSE.