Python, so they can use SageSage. From their website:
SageMath is a free open-source mathematics software system licensed under the GPL. It builds on top of many existing open-source packages: NumPyNumPy, SciPySciPy, matplotlibmatplotlib, SympySympy, MaximaMaxima, GAPGAP, FLINTFLINT, RR and many more. Access their combined power through a common, Python-based language or directly via interfaces or wrappers. Mission: Creating a viable free open source alternative to Magma, Maple, Mathematica and Matlab.