qdPy is a package to compute helioseismic eigenfrequencies using quasi-degenerate perturbation theory.

Forward model

Taken an input toroidal velocity profile in terms of $w_s(r)$ and computes the new eigenfrequencies using both degenerate perturbation theory (DPT) and quasi-degenrate perturbation theory (QDPT).

Inversions

-- yet to be implemented