Like an idiot, I'm going to try to do this in Python (which I know) and Rust (which I don't).
Python is in a Poetry project.
To start ...
cd python
poetry install
poetry shell
# Run tests to get the answers
# use -s or --nocapture because the answers are printed to STDOUT by the tests
nosetests -s tests/day_01/test_advent_01.py
Rust is a normal Rust kinda project.
cd rust
cargo run
# OR
cargo build --release
time ./target/release/advent # for speed bragging rights