[jaraco]

Manual backport of #160103 to 3.14; miss-islington could not apply it cleanly.

The conflict: zipfile/_path/_functools.py does not exist on 3.14 — it arrived with the zipp 3.23 refresh in gh-135276, which landed in 3.15. Rather than introduce a new private module and a none_as helper on a maintenance branch for a single call site, __str__ tests for None inline:

    def __str__(self):
        root = self.root.filename
        if root is None:
            root = ':zipfile:'
        return posixpath.join(root, self.at) if self.at else root

Note this cannot be shortened to self.root.filename or ':zipfile:': a zipfile whose filename is the empty string must keep rendering as empty, which test_unsupported_names covers.

The two new tests also use this branch's self.fixtures.enter_context idiom rather than self.enterContext, since gh-81954 — which introduced the enterContext style in this file along with a ResourceWarning on implicit ZipFile close — is main-only.

Verified on 3.14: test_zipfile passes (388 tests), including test_unsupported_names and the two new tests.

(cherry picked from commit ba96fab)

Co-authored-by: Jason R. Coombs jaraco@jaraco.com

• Issue: str(zipfile.Path()) not working when root attribute is io.BytesIO #100609

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