Beginning with version 0.9.0, JWST requires Python 3.5 or above.

To install a particular released version of the package, and all dependencies, we recommend using conda and a spec file that lists the exact versions of all packages to be installed. To create a new environment, use:

conda create -n jwst --file <URL>
source activate jwst

where <URL> is of the form:

Linux: http://ssb.stsci.edu/releases/jwstdp/0.9.6/latest-linux
OS X: http://ssb.stsci.edu/releases/jwstdp/0.9.6/latest-osx

Other particular versions can be installed by choosing a different version tag in place of "0.9.6" in the URL path. See the "Software vs DMS build version map" table below for a list of tags corresponding to particular releases.

To update to the latest nightly build:

conda update -n jwst --override-channels -c http://ssb.stsci.edu/astroconda-dev -c defaults --all

To install the development version of the repository, we recommend creating a new environment, using the astroconda channel to install the dependencies, and then installing from the github repository:

conda create -n jwst_dev --only-deps --override-channels -c http://ssb.stsci.edu/astroconda-dev -c defaults python=3.6 jwst
source activate jwst_dev
git clone https://github.com/spacetelescope/jwst.git
cd jwst
python setup.py develop

Once installed, the software can be updated to the lastest development version by updating the dependencies, pulling the latest version of master from the Github repository inside the jwst directory:

conda update -n jwst_dev --override-channels -c http://ssb.stsci.edu/astroconda-dev -c defaults --all
git pull origin master
python setup.py develop

To run the pipeline outside the STScI network, CRDS must be configured by setting two environment variables:

export CRDS_PATH=$HOME/crds_cache
export CRDS_SERVER_URL=https://jwst-crds.stsci.edu

Documentation (built daily from master) is available here:

https://jwst-pipeline.readthedocs.io/en/latest/

We welcome contributions and feedback on the project. Please follow the contributing guidelines to submit an issue or a pull request.

We strive to provide a welcoming community to all of our users by abiding to the Code of Conduct.

Unit tests can be run via pytest. We recommend using pytest-xdist so you can run them in parallel. Install pytest-xdist and run pytest in the top level of the repository

conda install pytest-xdist
pytest -n <cores>

where cores is the number of cores you'd like to use on your machine for the tests.

Regression tests - both the data and the result reports - are currently only accessible to STScI staff members. If you do need information about this, please open an issue.

Latest regression test results can be found here:

https://boyle.stsci.edu:8081/job/RT/job/JWST/

The test builds start at 11am and 6pm local Baltimore time every day on jwcalibdev.

To run the regression tests on your local machine, rsync or scp the input and comparison data locally

rsync -av <username>@jwcalibdev:/data4/jwst_test_data /my/local/path/

set the environment variable TEST_BIGDATA to this location

export TEST_BIGDATA=/my/local/path/jwst_test_data/

and then run the tests in the repository

cd /path/to/jwst/jwst/tests_nightly/general
pytest --bigdata .