diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..b7faf40 --- /dev/null +++ b/.gitignore @@ -0,0 +1,207 @@ +# Byte-compiled / optimized / DLL files +__pycache__/ +*.py[codz] +*$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 + +# UV +# Similar to Pipfile.lock, it is generally recommended to include uv.lock in version control. +# This is especially recommended for binary packages to ensure reproducibility, and is more +# commonly ignored for libraries. +#uv.lock + +# poetry +# Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control. +# This is especially recommended for binary packages to ensure reproducibility, and is more +# commonly ignored for libraries. +# https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control +#poetry.lock +#poetry.toml + +# pdm +# Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control. +# pdm recommends including project-wide configuration in pdm.toml, but excluding .pdm-python. +# https://pdm-project.org/en/latest/usage/project/#working-with-version-control +#pdm.lock +#pdm.toml +.pdm-python +.pdm-build/ + +# pixi +# Similar to Pipfile.lock, it is generally recommended to include pixi.lock in version control. +#pixi.lock +# Pixi creates a virtual environment in the .pixi directory, just like venv module creates one +# in the .venv directory. It is recommended not to include this directory in version control. +.pixi + +# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm +__pypackages__/ + +# Celery stuff +celerybeat-schedule +celerybeat.pid + +# SageMath parsed files +*.sage.py + +# Environments +.env +.envrc +.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/ + +# PyCharm +# JetBrains specific template is maintained in a separate JetBrains.gitignore that can +# be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore +# and can be added to the global gitignore or merged into this file. For a more nuclear +# option (not recommended) you can uncomment the following to ignore the entire idea folder. +#.idea/ + +# Abstra +# Abstra is an AI-powered process automation framework. +# Ignore directories containing user credentials, local state, and settings. +# Learn more at https://abstra.io/docs +.abstra/ + +# Visual Studio Code +# Visual Studio Code specific template is maintained in a separate VisualStudioCode.gitignore +# that can be found at https://github.com/github/gitignore/blob/main/Global/VisualStudioCode.gitignore +# and can be added to the global gitignore or merged into this file. However, if you prefer, +# you could uncomment the following to ignore the entire vscode folder +# .vscode/ + +# Ruff stuff: +.ruff_cache/ + +# PyPI configuration file +.pypirc + +# Cursor +# Cursor is an AI-powered code editor. `.cursorignore` specifies files/directories to +# exclude from AI features like autocomplete and code analysis. Recommended for sensitive data +# refer to https://docs.cursor.com/context/ignore-files +.cursorignore +.cursorindexingignore + +# Marimo +marimo/_static/ +marimo/_lsp/ +__marimo__/ diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..95ef53e --- /dev/null +++ b/LICENSE @@ -0,0 +1,21 @@ +MIT License + +Copyright (c) 2025 Max Ratushniy + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/src/fast_pow.py b/src/fast_pow.py index 1ba1dc1..b7e6a19 100644 --- a/src/fast_pow.py +++ b/src/fast_pow.py @@ -1,6 +1,18 @@ -def fastPow(number, power): - result = number - while power != 1: - result *= result - power = power // 2 +# Simplistic power implementation for non-negative integer powers +def fast_pow(number, power: int): + if power == 0: + if number == 0: + raise Exception("0^0 is undefined") + + return 1 + + if power < 0: + raise Exception("negative power unsupported") + + result = 1 + + while power != 0: + result *= number + power -= 1 + return result diff --git a/src/luhn.py b/src/luhn.py index 11d993c..d6ba99e 100644 --- a/src/luhn.py +++ b/src/luhn.py @@ -1,14 +1,30 @@ -def luhnСheck(cardNumber): - digits = [int(d) for d in str(cardNumber) if d.isdigit()] +def luhn_check(number): + digits = [int(d) for d in str(number) if d.isdigit()] + + if len(digits) < 2: + raise Exception("less than two digits") + control = digits.pop() - parity = (len(digits))%2 + parity = (len(digits) - 1) % 2 total = 0 - for i in range(len(digits)): + + for i in reversed(range(len(digits))): + value = digits[i] + if i % 2 == parity: - doubled = digits[i] * 2 - if doubled > 9: - doubled -= 9 - total += doubled - else: - total += digits[i] - return (total + control) % 10 == 0 + value = digits[i] * 2 + if value > 9: + value -= 9 + + total += value + + return (10 - (total % 10)) % 10 == control + + +if __name__ == "__main__": + response = ["incorrect", "correct"] + prompt = int(input()) + + while prompt != -1: + print(response[int(luhn_check(prompt))]) + prompt = int(input()) diff --git a/test/test_fast_pow.py b/test/test_fast_pow.py index 5e4aebd..7fc039d 100644 --- a/test/test_fast_pow.py +++ b/test/test_fast_pow.py @@ -1,9 +1,31 @@ -from src.fast_pow import fastPow +from itertools import product +import pytest -def test_two_power_two(): - assert fastPow(2, 2) == 4 +from src.fast_pow import fast_pow -def test_negative(): - assert fastPow(-1, 4) == 1 +def test_positive_power(): + for n, p in product(range(-1000, 1000), range(1, 100)): + assert fast_pow(n, p) == n**p + + +def test_negative_power(): + for n, p in product(range(-1000, 1000), range(1, 100)): + with pytest.raises(Exception) as e: + fast_pow(n, -p) + assert e == "negative power unsupported" + + +def test_zero_power(): + for n in range(-1000, 100): + if n == 0: + continue # tested separately + + assert fast_pow(n, 0) == 1 + + +def test_0_pow_0(): + with pytest.raises(Exception) as e: + fast_pow(0, 0) + assert e == "0^0 is undefined" diff --git a/test/test_luhn.py b/test/test_luhn.py index 1c021a2..752d190 100644 --- a/test/test_luhn.py +++ b/test/test_luhn.py @@ -1,9 +1,17 @@ -from src.luhn import luhnСheck +import pytest + +from src.luhn import luhn_check + + +def less_than_two(): + with pytest.raises(Exception) as e: + luhn_check("1") + assert e == "less than two digits" def test_good(): - assert luhnСheck("8571 2612 1234 5467") + assert luhn_check("17893729974") def test_bad(): - assert not luhnСheck("4561 2612 1234 5463") \ No newline at end of file + assert not luhn_check("17893729970")