I would say .com extension as an indication of an executable is acceptable exactly because we are on HackerNews (and not W3Schools.com, for instance). Basically, IMHO, "hackers" are supposed to know a bit of (arcane) history as well: "hacking", to me, presumes a deeper investment in the field. Otherwise, they might only be (web) software developers (or engineers).

But to each their own.

(I think the most unfortunate thing is what content is present on the python.com domain, as a sibling comment highlighted)