Comment (by Roland Haas):

Note that there is no (to my best knowledge) documentation in the sense that there is no document explaining (other than the example) how to use the script, what its offered functionality and its limitations are.

There are no Python docstrings.

There is no doc/documentation.tex which means NRPyPN will not show up on http://einsteintoolkit.org/documentation/ThornGuide.php

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2417/include-pn-expressions-for-initial-momenta