Installation

There are numerous ways to install Python and Gammapy as a user. On this page, we list the most common ones. In general, we recommend using virtual environments when using Gammapy. This way you have complete control over the additional packages that you may use in your analysis and you work with well defined computing environments. This enables you to easily share your work and ensure reproducibility of your scientific analysis results. You can also install Gammapy for development.

Using Anaconda / Miniconda

The easiest way to install Gammapy is to install the Anaconda or Miniconda Python distribution. To install the latest stable version of Gammapy and its dependencies using conda, execute this command in a terminal:

conda install -c conda-forge gammapy

To update an existing installation you can use:

conda update gammapy

To install a specific version of Gammapy just execute:

conda install -c conda-forge gammapy=1.0

If you encounter any issues you can check the Troubleshooting guide.

Using Mamba

Alternatively, you can use Mamba for the installation. Mamba is an alternative package manager that supports most of conda’s commands but offers higher installation speed and more reliable environment solutions. To install mamba in the Conda base environment:

conda install mamba -n base -c conda-forge

Then install Gammapy through:

mamba install gammapy

Mamba supports the same commands available in conda. Therefore, updating and installing specific versions follows the same process as above, just simply replace the conda command with the mamba command.

Using pip

To install the latest Gammapy stable version (see Gammapy page on PyPI) using pip:

python -m pip install gammapy

This will install Gammapy with the required dependencies only.

To install Gammapy with all optional dependencies, you can specify:

python -m pip install gammapy[all]

To update an existing installation use:

python -m pip install gammapy --upgrade

To install a specific version of Gammapy use:

python -m pip install gammapy==1.0

To install the current Gammapy development version with pip use:

python -m pip install git+https://github.com/gammapy/gammapy.git#egg=gammapy

If you want to study or edit the code locally, use the following:

git clone https://github.com/gammapy/gammapy.git
cd gammapy
python -m pip install .

If you encounter any issues you can check the Troubleshooting guide.

Using other package managers

Gammapy has been packaged for some Linux package managers. E.g. on Debian, you can install Gammapy via:

sudo apt-get install python3-gammapy

To get a more fully featured scientific Python environment, you can install other Python packages using the system package manager (apt-get in this example), and then on top of this install more Python packages using pip.

Example:

sudo apt-get install \
    python3-pip python3-matplotlib \
    ipython3-notebook python3-gammapy

python3 -m pip install gammapy

Note that the Linux package managers typically have release cycles of 6 months, or yearly or longer, meaning that you’ll typically get an older version of Gammapy. However, you can always get the recent version via pip or conda (see above).