The respy package can be conveniently installed from the Python Package Index (PyPI) or directly from its source files. We currently support only Python 3.6+. We develop the package mainly on Linux systems, but the test battery ensures compatibility with Windows and MacOS.

Python Package Index

You can install the stable version of the package the usual way.

$ pip install respy

We provide a pure Python implementation as our baseline. However, to address performance constraints, we also maintain scalar and parallel Fortran implementations. If additional requirements are met, both are installed automatically.

… adding Fortran


Please make sure that the gfortran compiler is available on your path and it knows where to find the Linear Algebra PACKage (LAPACK) library.

On Ubuntu systems, both can be achieved by the following commands:

$ sudo apt-get install gfortran
$ sudo apt-get install libblas-dev liblapack-dev


For Windows users, the installation is more complicated. Install the 32-bit or 64-bit version of MSYS2. Start the MSYS2 MinGW terminal and type the following command to update the package list and packages.

$ pacman -Syu

After that, we install the gfortran compiler and lapack and blas. Choose the first command if you installed the 64-bit version, the second otherwise.

$ pacman -S mingw64/mingw-w64-x86_64-gcc-fortran /      # for 64-bit
            mingw64/mingw-w64-x86_64-lapack /

$ pacman -S mingw64/mingw-w64-i686-gcc-fortran /        # for 32-bit
            mingw64/mingw-w64-i686-lapack /

At last, make sure that C:\msys64\mingw64\bin and C:\msys64\usr\bin is on your PATH. Again, exchange 64 with 32 depending on your installer.

If so, just call a slightly modified version of the installation command.

$ pip install --no-binary respy respy

The –no-binary flag is required for now to avoid the use of Python Wheels and ensure a compilation of the Fortran source code during the build.

… adding Parallelism


We use the Message Passing Interface (MPI) library. This requires a recent version of its MPICH implementation available on your compiler’s search path which was build with shared/dynamic libraries. Install it with

sudo apt-get install libmpich-dev


Install the latest SDK and the Setup of MSMPI and make sure that /Microsoft MPI/bin/ is on the PATH.

Source Files

You can download the sources directly from our GitHub repository.

$ git clone

Once you obtained a copy of the source files, installing the package in editable mode is straightforward.

$ pip install -e .

Test Suite

Please make sure that the package is working properly by running our test suite using pytest.

$ python -c "import respy; respy.test()"