PYSHELLSPEC is an advanced astrophysical tool for modeling of binary systems with circumstellar matter (e.g. accretion disk, jet), computation of interferometric observables |V^2|, arg T_3, |T_3|, |dV|, arg dV, comparison of light curves, spectro-interferometry, spectra and SED with observations, and both global and local optimisation of system parameters. It is based on Shellspec, a 1-dimensional LTE radiation transfer code by Budaj & Richards (2004). If you use this code, please cite the original references: M. Bro\v z, D. Mourard, J. Budaj, P. Harmanec, H. Schmitt, I. Tallon-Bosc, D. Bonneau et al., Optically thin medium in \beta Lyr A system, A&A 645, A51, 2021. D. Mourard, M. Bro\v z, J. Nemravov\'a, P. Harmanec, J. Budaj, F. Baron, J.D. Monnier et al., Physical properties of \beta Lyr A and its opaque accretion disk, A&A 618, A112, 2018. The code and examples can be downloaded from: https://sirrah.troja.mff.cuni.cz/~mira/betalyr/ The authors are Jana Nemravova and M. Broz, as described in the Changelog. -- For differential evolution, it was necessary to download: _differentialevolution.py put it in: /usr/lib/python2.7/dist-packages/scipy/optimize/ and modify __init.py__: from ._differentialevolution import differential_evolution -- Installation of several standard python modules was required: apt-get install python apt-get install python-matplotlib apt-get install python-numpy apt-get install python-scipy apt-get install python-nlopt apt-get install python-astropy Alternatively, one can use: apt-get install python-pip pip install astropy ...