Getting Set Up

The Panel library is a complex project which provides a wide range of data interfaces and an extensible set of plotting backends, which means the development and testing process involves a wide set of libraries.

Preliminaries

Git

The Panel source code is stored in a Git source control repository. The first step to working on Panel is to install Git on to your system. There are different ways to do this depending on whether, you are using Windows, OSX, or Linux.

To install Git on any platform, refer to the Installing Git section of the Pro Git Book.

Conda

Developing Panel requires a wide range of packages that are not easily and quickly available using pip. To make this more manageable, core developers rely heavily on the conda package manager for the free Anaconda Python distribution. However, conda can also install non-Python package dependencies, which helps streamline Panel development greatly. It is strongly recommended that anyone developing Panel also use conda, and the remainder of the instructions will assume that conda is available.

To install Conda on any platform, see the Download conda section of the conda documentation.

Cloning the Repository

The source code for the Panel project is hosted on GitHub. To clone the source repository, issue the following command:

git clone https://github.com/pyviz/panel.git

This will create a panel directory at your file system location. This panel directory is referred to as the source checkout for the remainder of this document.

Create a development environment

Since Panel interfaces with a large range of different libraries the full test suite requires a wide range of dependencies. To make it easier to install and run different parts of the test suite across different platforms Panel uses a library called pyctdev to make things more consistent and general. To start with cd into the panel directory and then set up conda using the following commands:

cd panel
conda install -c pyviz "pyctdev>0.5.0"
doit ecosystem_setup

Once pyctdev is available and you are in the cloned panel repository you can set up an environment with:

doit env_create -c pyviz/label/dev -c conda-forge --name=panel_dev --python=3.7

Specify the desired Python version, currently Panel officially supports Python 2.7, 3.5, 3.6 and 3.7. Once the environment has been created you can activate it with:

conda activate panel_dev

Install Panel in editable mode

To perform an editable install of Panel, including all the dependencies required to run the full unit test suite, run the following:

doit develop_install -c pyviz/label/dev -c conda-forge -c bokeh -o build -o tests -o recommended

The above command installs Panel’s dependencies using conda, then performs a pip editable install of Panel.

Developing custom models

If you are adding or editing a bokeh model, you can use panel build panel to build the javascript. The build command is just an alias for bokeh build; see the Bokeh developer guide for more information about developing bokeh models.

Next Steps

You will likely want to check out the Testing guide. Meanwhile, if you have any problems with the steps here, please contact the developers.