GH-128520: pathlib ABCs: allow tests to be run externally (#131315)

Adjust the tests for the `pathlib.types` module so that they can be run
against the `pathlib-abc` PyPI package, which is a backport of the module
for older Python versions.

Specifically, we add a `.support.is_pypi` switch that is false in the
stdlib and true in the pathlib-abc package. This controls which package
we import, and whether or not we run tests against `PurePath` and `Path`.

For compatibility with older Python versions, we stop using
`zipfile.ZipFile.mkdir()` and `zipfile.ZipInfo._for_archive()`.

1 files changed, 8 insertions, 2 deletions

diff --git a/Lib/test/test_pathlib/support/lexical_path.py b/Lib/test/test_pathlib/support/lexical_path.py
index 6298513..f29a521 100644
--- a/Lib/test/test_pathlib/support/lexical_path.py
+++ b/Lib/test/test_pathlib/support/lexical_path.py
@@ -4,11 +4,17 @@ Simple implementation of JoinablePath, for use in pathlib tests.
 
 import ntpath
 import os.path
-import pathlib.types
 import posixpath
 
+from . import is_pypi
 
-class LexicalPath(pathlib.types._JoinablePath):
+if is_pypi:
+    from pathlib_abc import _JoinablePath
+else:
+    from pathlib.types import _JoinablePath
+
+
+class LexicalPath(_JoinablePath):
     __slots__ = ('_segments',)
     parser = os.path