LaTeX: \catcode assignment should be terminated

[jfbu]

This is almost irrelevant. But \catcode`\_=8 without termination might
let LaTeX expand prematurely its token stream. Of course here in the
context of fancyvrb.sty chances are 99.99% that what comes next does not
expand or expands safely. I did not look in code.

Only a matter of style, to be on the safe side.

[jfbu]

here in the
context of fancyvrb.sty

I mean that most people use the LaTeXFormatter output with fancyvrb latex package, because the syntax used in clearly targeted at that package.

Actually on looking at its doc now I see it gives an example from which the Pygments is probably inspired, and there is no \relax there. However, at Sphinx we will probably drop fancyvrb in future (cf discussion at sphinx-doc/sphinx#8686) to solve some issues with page breaks (already we have to work hard to get wrapping of code lines). So in future the codes={...} option might end in some other context than fancyvrb code. It would then be better to use the safer syntax I indicated, although, as I said, this is almost of nil relevance.

[birkenfeld]

Thanks!