I left a few comments on rietveld.

In the rst docs the markup used for arguments is *arg*, and this is sometimes reflected in docstrings too.  We might want to do this here too, instead of using 'arg' (using 'attr' for attributes it's fine though).

> maybe docstrings should be also added in Modules/_elementtree.c?

Maybe we could have a loop that does something like cfunc.__doc__ = pyfunc.__doc__?