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We describe Rabacus, a Python package for calculating the transfer ofhydrogen ionizing radiation in simplified geometries relevant to astronomy andcosmology. We present example solutions for three specific cases: 1) asemi-infinite slab gas distribution in a homogeneous isotropic background, 2) aspherically symmetric gas distribution with a point source at the center, and3) a spherically symmetric gas distribution in a homogeneous isotropicbackground. All problems can accommodate arbitrary spectra and density profilesas input. The solutions include a treatment of both hydrogen and helium, aself-consistent calculation of equilibrium temperatures, and the transfer ofrecombination radiation. The core routines are written in Fortran 90 and thenwrapped in Python leading to execution speeds thousands of times faster thanequivalent routines written in pure Python. In addition, all variables haveassociated units for ease of analysis. The software is part of the PythonPackage Index and the source code is available on Bitbucket athttps://bitbucket.org/galtay/rabacus . In addition, installation instructionsand a detailed users guide are available at http://pythonhosted.org//rabacus .

Rabacus: A Python Package for Analytic Cosmological Radiative Transfer Calculations