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Developer Installation

From the root directory of the repository, run these commands:

  1. cd client/verta/
  2. python2 -m pip install virtualenv && virtualenv venv/ to create a Python 2 virtual environment
    • developing in Python 2 is recommended to help ensure compatibility
    • if you wish to work in Python 3 (which is necessary for building docs locally), instead run python3 -m venv venv/
    • for both Python 2 and Python 3, you can replace the venv/ argument with any unique name you'd like
  3. source venv/bin/activate to activate the virtual environment
  4. python -m pip install -r requirements.txt to install packages for development, testing, and documentation
    • if you see error: [Errno 13] Permission denied: 'verta.egg-info/requires.txt', delete the verta.egg-info/ directory and try again

Linting

Python doesn't have complete static nor compile-time checking, so linting is important for catching potential bugs.

ModelDB uses pylint as its linter, which was installed during Developer Installation. Many Python IDEs can be configured to run pylint on file save (see instructions/plugins for VS Code and PyCharm).

Alternatively, pylint can be run manually through the Terminal using

pylint --disable=R,C,W verta

from inside client/verta/

Test Writing

ModelDB uses pytest as its testing framework. See the testing README for more details.

Documentation Writing

ModelDB uses sphinx as its documentation building framework. See the docs README for more details.

Example and Demo Writing

Jupyter Notebook Formatting

Before committing a Jupyter notebook we have to:

  • remove code cell outputs to prevent merge conflicts later, since outputs may change from run to run
  • preserve code cell execution numbers to enable easy reference in walkthroughs

This can be done automatically with a pre-save hook:

  1. create a Jupyter config file using jupyter notebook --generate-config
  2. open the resulting ~/.jupyter/jupyter_notebook_config.py in a code editor
  3. replace the line 
    #c.ContentsManager.pre_save_hook = None
    with 
    def number_cells(model, **kwargs):
    if model['type'] != 'notebook':
        return  # only run on notebooks
    if model['content']['nbformat'] != 4:
        return  # only run on nbformat v4
    code_cells = (cell
                  for cell in model['content']['cells']
                  if cell['cell_type'] == 'code')
    for i, cell in enumerate(code_cells, start=1):
        cell['outputs'] = []
        cell['execution_count'] = i
c.ContentsManager.pre_save_hook = number_cells

Package Publication

  1. Run the test suite and verify that it meets expectations.
  2. Update __version__ in __about__.py with a new version number.
    • Increment the minor version for backwards-incompatible changes or a major set of new features.
    • Increment the patch version for minor new features and bug fixes.
  3. Update changelog.rst.
  4. Commit the updated __about__.py and changelog.rst to a new branch and submit a pull request.
  5. Once the pull request is approved and merged, a Verta core team member shall tag the merge commit using e.g. git tag -a client-v0.0.0 -m '' && git push --follow-tags, with the appropriate version number.

Publish to PyPI

  1. Launch the Client's PyPI publication pipeline on Jenkins.
  2. Verify that the package number has been updated on PyPI.
  3. The new version will be pip installable shortly.

Publish to conda-forge

  1. Some time after PyPI publication, a conda-forge bot will automatically submit a Pull Request to the verta feedstock repository.
  2. Make any necessary additional changes to recipe/meta.yaml.
    • The only changes we might need to make are in our package's listed dependencies, since the conda-forge bot simply copies it from the previous version.
    • Other organizations would need to make additional changes if e.g. they have C dependencies, but we do not so there is no need to worry.
    • Verify the checksum if you'd like.
  3. Wait for the build tests in the Pull Request to succeed.
  4. Merge the Pull Request.
  5. Verify that the package number has been updated on Anaconda Cloud.
  6. The new version will be conda install -c conda-forgeable after an hour or so.