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[3.9] bpo-40592: shutil.which will not return None anymore if ; is the last char in PATHEXT (GH-20088) (GH-22912)

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shutil.which will not return None anymore for empty str in PATHEXT
Empty PATHEXT will now be defaulted to _WIN_DEFAULT_PATHEXT
(cherry picked from commit da6f098188)


Co-authored-by: Christopher Marchfelder <marchfelder@googlemail.com>
This commit is contained in:
Miss Skeleton (bot) 2020-10-23 14:38:05 -07:00 • committed by GitHub
parent f8d96b98a4
commit c437fe39cf
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3 changed files with 24 additions and 1 deletions
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17
Lib/test/test_shutil.py
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@ -1848,6 +1848,23 @@ def test_pathext(self):
rv = shutil.which(program, path=self.temp_dir)
self.assertEqual(rv, temp_filexyz.name)
# Issue 40592: See https://bugs.python.org/issue40592
@unittest.skipUnless(sys.platform == "win32", 'test specific to Windows')
def test_pathext_with_empty_str(self):
ext = ".xyz"
temp_filexyz = tempfile.NamedTemporaryFile(dir=self.temp_dir,
prefix="Tmp2", suffix=ext)
self.addCleanup(temp_filexyz.close)
# strip path and extension
program = os.path.basename(temp_filexyz.name)
program = os.path.splitext(program)[0]
with support.EnvironmentVarGuard() as env:
env['PATHEXT'] = f"{ext};" # note the ;
rv = shutil.which(program, path=self.temp_dir)
self.assertEqual(rv, temp_filexyz.name)
class TestWhichBytes(TestWhich):
def setUp(self):