This is a directory of python codes used to assess how much water the interiors of the TRAPPIST-1 planets may hold, and how that water could be supplied to the exterior of these planets via volcanic outgassing. A full model description is found in the associated manuscript: "Statistical Geochemical Constraints on Present-Day Water Outgassing as a Source of Secondary Atmospheres on the TRAPPIST-1 Exoplanets" by Thomas, T. B., Meadows, V. S., Krissansen-Totton, J., Gialluca, M., Wogan, N., & Catling, D.C. The Planetary Science Journal. This repository contains all the data and code required to reproduced the manuscript figures.