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Tools for computing detailed optically thick spectral line profiles out oflocal thermodynamic equilibrium have always been focused on speed, due to thelarge computational effort involved. With the Lightweaver framework, we haveproduced a more flexible, modular toolkit for building custom tools in ahigh-level language, Python, without sacrificing speed against the currentstate of the art. The goal of providing a more flexible method for constructingthese complex simulations is to decrease the barrier to entry and allow morerapid exploration of the field.  In this paper we present an overview of the theory of optically thick NLTEradiative transfer, the numerical methods implemented in Lightweaver includingthe problems of time-dependent populations and charge-conservation, as well asan overview of the components most users will interact with, to demonstratetheir flexibility.

The Lightweaver Framework for NLTE Radiative Transfer in Python