[docs] [issue14013] tarfile should expose supported formats

[Lars Gustäbel]

Lars Gustäbel <lars at gustaebel.de> added the comment:

I think this is a reasonable proposal. I think it is good style to let tarfile figure out which supported compression methods are available instead of shutil or the user. So far I have no objections.

Following 3.3's crypt module, I think the name `methods' is superior to `formats' (maybe `compression_methods' is even better). Also, crypt's concept of a sorted list from stronger to weaker could also make sense here: ["xz", "bz2", "gz"]. Why not?

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