Something does not work and you wish to fix it? Are you curious to see how it works? For development:

# Clone
git clone --recursive https://github.com/exabl/snek5000.git

# Activate paths: Start here. Always!
cd snek5000
source activate.sh

Now you should setup a Python environment. There are two ways to do this (and it has to be done only once):

• Using venv

  python -m venv venv
  source venv/bin/activate

• Using conda

  conda env create -n snek5000
  conda activate snek5000

Finally, to install in development mode:

pip install -e '.[dev]'
pip install --no-deps -r ./requirements-test.txt

• Editor: Use an editor which supports EditorConfig

• Style guide: For Python code, black, isort and flake8 are used to check and lint. Installing pre-commit would enforce the style automatically as a git hook.

  pre-commit install

• Branching model: The development uses branches and pull-requests for experimental features. We also rely on git submodules to track Nek5000. You may find the following git branches when you clone snek5000:

  • master: main branch
  • fix/..., enh/...: feature branches

  Executing the following command would configure git to work with submodules easily and ensures consistency:

  # Enable recursion for relevant commands, such that
  # regular commands recurse into submodules by default
  git config submodule.recurse true

• Testing: Run pytest from the top-level directory. The test-cases can be found under tests/ directory. To run the slow tests too execute pytest --runslow.

• Debugging: Set the environment variable:

  export SNEK_DEBUG=true

  to activate debugging logs and longer tests.

Vim users could benefit by setting:

set secure exrc

This sources the .exrc file which comes along with the repository and enables syntax highlighting for file extensions used in lib/Nek5000.