Cyto 🦠

Idiomatic boilerplate and glue code for Python

Cyto lets you:

• Create a click CLI from a pydantic model
• Load pydantic settings from TOML files [WIP]
• Daemonize your application [WIP]

Cyto is the bridge between an oppinionated selection of Python tech. Cyto is everything you need to create a modern Python app. Cyto is the glue and boilerplate code that you no longer have to write yourself.

Only pay for what you use

So you only want the click–pydantic integration but not the TOML loader? Don't worry, Cyto is split into so-called extras so you can select just the extras that you want. In turn, Cyto only pulls in the dependencies for the selected extras. This is the "only pay for what you use" principle. In fact, Cyto has zero dependencies per default.

Here is the list of extras:

• settings.sources.cli: Create a click CLI from a pydantic model
• settings.sources.toml: Load pydantic settings from TOML files [WIP]
• app: [WIP]

Installation

Install Cyto along with all extras:

pip install cyto[all]

Similar for poetry:

poetry add cyto[all]

Choose specific extras

If you only want a specific extra, choose that when you install Cyto. E.g.:

pip install cyto[settings.sources.cli]

Similar for poetry:

poetry add cyto[settings.sources.cli]

Development

Python Version

Development requires Python 3.8 or later. Test your python version with:

python3 --version

If you have multiple python installations, you can replace python3 with a specific version (e.g., python3.8) in the steps below.

Getting Started

Do the following:

1. Clone this repository

   git clone git@github.com:sbtinstruments/cyto.git
   

2. Install poetry (for dependency management)

   curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python3
   

3. Optional: Use a local poetry virtual environment

   poetry config --local virtualenvs.in-project true
   

   This integrates better with editors such as Visual Studio Code.
4. Create poetry's virtual environment and get all dependencies and all extra features.

   poetry install --extras all
   

5. Optional: Run the QA basic tools (e.g., isort, black, pylint, mypy) automatically before each commit

   poetry run pre-commit install
   

Quality Assurance (QA) Tools

QA Basic Tools

All QA basic tools automatically run in Jenkins for each commit pushed to the remote repository. If you installed the pre-commit hooks, all QA basic tools automatically run before each commit too.

The QA basic tools are:

• isort (for import ordering)
• black (for formatting)
• pylint (for linting)
• mypy (for type checking)

You can run the QA basic tools manually. This is useful if you don't want to install the pre-commit hooks.

Run the QA basic tools manually with:

poetry run task isort
poetry run task black
poetry run task pylint
poetry run task mypy

Run all the basic QA tools manually with a single command:

poetry run task pre-commit

Note that this doesn't require you to install the pre-commit hooks.

QA Test Tools

All of the tools below automatically run in Jenkins for each commit pushed to the remote repository.

The QA test tools are:

• tox (for automation across Python versions)
• pytest (the test framework itself)
• pytest-cov (for test coverage percentage)

Run the tests manually:

1. Install tox

   python3 -m pip install tox
   

2. Start a tox run:

   tox
   

Note that tox invokes pytest in a set of virtual environments. Said virtual environments have nothing to do with poetry's virtual environment. Poetry and tox runs in isolation of each other.

Visual Studio Code

Settings

We have a default settings file that you can use via the following command:

cp .vscode/settings.json.default .vscode/settings.json

This is optional.

Python Interpreter

Hopefully, you used the local poetry virtual environment during installation (the poetry config --local virtualenvs.in-project true part). This way, Visual Studio Code automatically finds the Python interpreter within poetry's virtual environment.

Alternatively, you can point Visual Studio Code to poetry's global virtual environments folder. Add the following entry to your ./vscode/settings.json file:

{ "python.venvPath": "~/.cache/pypoetry/virtualenvs" }

Then, you look for the poetry's currently active virtual environment:

poetry env list

Lastly, you use the Visual Studio Code command Python: Select Interpreter and choose the interpreter inside poetry's currently active virtual environment.