Before installing stormpy, make sure

  • Python 3 is available on your system.

  • pycarl is available.

  • Storm is available on your system.

To avoid issues, we suggest that both pycarl and Storm use the same version of carl. The simplest way of ensuring this is to first install carl as explained in the Storm installation guide. You can then install Storm and pycarl independently.

Compatibility of stormpy and Storm

Note that stormpy and Storm are continuously extended and modified. It is therefore important to use compatible versions of stormpy and Storm. You have two choices for stormpy depending on the version of Storm you are using:

  1. Release version: You use the latest release of Storm or the stable branch. In these cases, you need to use the latest release of stormpy. For example, Storm 1.6.0 is compatible with stormpy 1.6.0.

  2. Master branch: You use the master branch of Storm. In this case, you need to use the master branch of stormpy as well. Note that due to ongoing development in Storm, after some commits, the stormpy master might not work with the Storm master anymore. We will fix such issues as fast as possible.


Unfortunately, Stormpy currently does not work in conjunction with a homebrew installation of Storm.

Installation Steps

Virtual Environments

Virtual environments create isolated environments for your projects. This helps to keep your system clean, work with different versions of packages and different version of python. While it is not required, we recommend the use of such virtual environments. To get you started, we recommend this guide or this primer.

In short you can create a virtual environment env with:

$ pip install virtualenv
$ virtualenv -p python3 env
$ source env/bin/activate

The last step activates the virtual environment. Whenever using the environment, the console prompt is prefixed with (env).

Building stormpy

Clone the compatible stormpy version into any suitable location. For the master of stormpy use:

$ git clone
$ cd stormpy

or for the latest release use (remember to use the correct version):

$ git clone --branch 1.6.0
$ cd stormpy

Build stormpy in develop mode using your favourite python distribution way of installing: e.g.:

$ python3 develop


$ pip install -ve .

Optional build arguments

The build step build_ext also takes optional arguments for a more advanced configuration of stormpy.

  • Specifying which Storm library to use

    If you have multiple versions of Storm or cmake is not able to find your Storm version, you can specify the --storm-dir YOUR-PATH-TO-STORM flag:

    $ python3 build_ext --storm-dir YOUR-PATH-TO-STORM develop
  • Disabling functionality

    If you want to disable certain functionality in stormpy from being built you can use the following flags:

    • --disable-dft to disable support for dynamic fault trees (DFTs)

    • --disable-pars to disable support for parametric models

  • Building stormpy in debug mode

    If you want to build stormpy in debug mode you can add the --debug flag:

    $ python3 build_ext --debug develop
  • Setting number of build threads

    The build of stormpy uses all available cores per default. If you want to configure the number of threads manually you can specify the --jobs (or -j) flag:

    $ python3 build_ext --jobs 2 develop

Testing stormpy installation

After building, you can run the test files by either:

$ python3 test

or by invoking pytest directly with:

$ pip install pytest
$ py.test tests/

If the tests pass, you can now use stormpy. To get started, continue with our Getting Started, consult the test files in tests/ or the Stormpy API Reference (work in progress).

Building stormpy documentation

To build this documentation, you need additional python dependencies as well as pandoc. You can install the required python dependencies automatically with:

$ python develop easy_install stormpy[doc,numpy]

or manually with:

$ pip install sphinx sphinx_bootstrap_theme nbsphinx ipykernel numpy

Then build the documentation:

$ cd doc
$ make html