Looks good to me, text/vtt is has IANA registration https://www.iana.org/assignments/media-types/text/vtt and .srt is well known plain/text https://www.matroska.org/technical/subtitles.html#srt-subtitles.

@Josephine-Marie Can you add a short NEWS entry like Add MIME types for ...? See https://devguide.python.org/ about how to do it.

yes, sorry I forgot, I hope it is fine that I used 00000 as a bug number since this has none.

Awww yes, forgot that NEWS issues have to be linked to an issue... (no you can't use 0000 sadly).

To do things properly you should open an issue on bugs.python.org, I tried bypassing that for simplicity but it won't do ;)

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Looks good to me!

I know the first PR in cpython may be overwelming, but there's one last little step: you'll need to sign the CLA, the why and how is described here: https://devguide.python.org/pullrequest/#cla.

I did, it says that I signed and its all correct. Thank you so much for your help @JulienPalard

Thanks @Josephine-Marie for your first PR in Python!