featureflagclient

Allows you to use feature flags in your code, works with any JSON feature flag service.

Features:

Extremely light-weight.
Feature flag service agnostic.

Get started

You can install this via pip from the package index as

pip install featureflagclient

If you have a JSON file in the cloud like this one:

featureflag.tech/node/exampleflag.json

You can access it like so

from featureflagclient.client import Featureflagclient

f2c = Featureflagclient("https://featureflag.tech/node/exampleflag.json")

if (f2c.get( "trueBoolean" )) {
	// do some python
}

A great way to use feature flags is to use the values from your flag source but override them in specific contexts. For example with a web application, you can have a feature disabled by default in your live production, but then override the value using a cookie or parameter in the request.

For example:

from featureflagclient.client import Featureflagclient

f2c = Featureflagclient(
	"https://featureflag.tech/node/exampleflag.json",
	{
		"falseBoolean": req.param("falseBooleanOverride") or None
	}
)

if (f2c.get( "trueBoolean" )) {
	// do some python
}

Developing

Setting up from scratch

Project uses the following Python libs:

Python 3.6
pyenv for managing the version of Python
pipenv for managing dependencies and the Python env
pytest for unit testing
mypy for static typing (not yet true)
flake8 for code linting (not yet true)

pyenv - python version manager

brew install pyenv

Add this to .bash_profile

eval "$(pyenv init -)"

reload terminal session.

python 3.6.5

pyenv install 3.6.5

Setup env with dependencies

cd [repo directory]
pipenv install
pipenv shell

Run the tests

pytest -v

Lint the project code files

flake8 featureflagclient/client.py
flake8 tests/integration_tests.py
flake8 tests/unit_tests.py

Updating code

Use mypy to make python statically typed

mypy featureflagclient/client.py

Release new version

Bump the version number in setup.py
Delete all the contents of the dist dir
Create distribution files:

python setup.py sdist bdist_wheel

Push to pypi:

twine upload dist/*

Check the deployment at: