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bpo-23082: Better error message for PurePath.relative_to() from pathlib (GH-19611)

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Co-authored-by: Sadhana Srinivasan <rotuna@Sadhanas-MBP.fritz.box>
(cherry picked from commit 448325369f)

Co-authored-by: Rotuna <sadhanasrinivasan@protonmail.com>
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Miss Islington (bot) 2020-05-25 13:01:20 -07:00 • committed by GitHub
parent 31084be618
commit 318a18eb88
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3 changed files with 6 additions and 2 deletions
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Lib/pathlib.py
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@ -922,7 +922,8 @@ def relative_to(self, *other):
cf = self._flavour.casefold_parts
if (root or drv) if n == 0 else cf(abs_parts[:n]) != cf(to_abs_parts):
formatted = self._format_parsed_parts(to_drv, to_root, to_parts)
raise ValueError("{!r} does not start with {!r}"
raise ValueError("{!r} is not in the subpath of {!r}"
" OR one path is relative and the other is absolute."
.format(str(self), str(formatted)))
return self._from_parsed_parts('', root if n == 1 else '',
abs_parts[n:])