Implement 2019 day 1 with tests in Python

2019/.gitignore

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+# Virtual environment
+venv
+
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/

2019/README.md

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+# Advent of Code 2019
+
+This is a quick-and-dirty implementation of all 2019 problems implemented in
+Python because I got fed up with C++ and really couldn't stand the missing
+stars on the [events page](https://adventofcode.com/2020/events).
+
+I'll try to incorporate unit tests and all because it's just nice programming,
+but this edition has decidedly less polish than my other attempts.

2019/aoc2019/__main__.py

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+import argparse
+import importlib
+import sys
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument('day', type=int)
+    parser.add_argument('input', type=argparse.FileType('rt'), nargs='?', default=sys.stdin)
+    parser.add_argument('-2', '--part2', action='store_true')
+
+    args = parser.parse_args()
+
+    try:
+        day = importlib.import_module(f'.day{args.day:02d}', __package__)
+
+        if args.part2:
+            function = day.part2
+        else:
+            function = day.part1
+
+        print(function(args.input))
+
+    except ImportError:
+        sys.exit(f'Invalid day: {args.day}')
+
+
+main()

2019/aoc2019/day01.py

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+from typing import TextIO
+
+
+def fuel_required(weight: int) -> int:
+    return max(0, weight // 3 - 2)
+
+
+def recursive_fuel_required(weight: int) -> int:
+    total = 0
+
+    while weight > 0:
+        weight = fuel_required(weight)
+        total += weight
+
+    return total
+
+
+def part1(data: TextIO) -> int:
+    return sum(fuel_required(int(line)) for line in data)
+
+
+def part2(data: TextIO) -> int:
+    return sum(recursive_fuel_required(int(line)) for line in data)

2019/requirements.txt

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+pytest

2019/tests/test_day01.py

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+from aoc2019.day01 import fuel_required, recursive_fuel_required
+
+import pytest
+
+
+@pytest.mark.parametrize('weight,required', [
+    (12, 2),
+    (14, 2),
+    (1969, 654),
+    (100756, 33583)
+])
+def test_fuel_required(weight: int, required: int) -> None:
+    assert fuel_required(weight) == required
+
+
+@pytest.mark.parametrize('weight,required', [
+    (14, 2),
+    (1969, 966),
+    (100756, 50346)
+])
+def test_fuel_required_recursive(weight: int, required: int) -> None:
+    assert recursive_fuel_required(weight) == required