[issue17673] add `copy_from` argument to temporaryfile

[R. David Murray]

R. David Murray added the comment:

Personally I prefer having the test create the needed test file, rather than adding a new file to the repository, for small files.  That's just my opinion, though; as you found what you did is common practice currently.  Your patch doesn't include the file, though.

(I haven't reviewed the rest of the patch.)

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nosy: +r.david.murray

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