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Spin connections are not implemented yet. However, note that generic tetrads are implemented and that the connection coefficients of the Levi-Civita connection can be expressed in any tetrad, see the methods coef() and connection_form() of affine connections.

If you are interested in implementing null tetrads and spin coefficients in SageMath, you are very welcome! Please visit this page.

Spin connections are not implemented yet. However, note that generic tetrads are implemented and that the connection coefficients of the Levi-Civita connection can be expressed in any tetrad, see the methods coef() and connection_form() of affine connections. So you can introduce a null tetrad by hand (cf. VectorFrame) and compute the spin coefficients by means of the above methods.

If you are interested in implementing null tetrads and spin coefficients in SageMath, you are very welcome! Please visit this page.