GH-126766: `url2pathname()`: handle empty authority section. (#126767)

Discard two leading slashes from the beginning of a `file:` URI if they
introduce an empty authority section. As a result, file URIs like
`///etc/hosts` are correctly parsed as `/etc/hosts`.

1 files changed, 5 insertions, 5 deletions

diff --git a/Lib/test/test_urllib.py b/Lib/test/test_urllib.py
index 66e948f..2c53ce3 100644
--- a/Lib/test/test_urllib.py
+++ b/Lib/test/test_urllib.py
@@ -1549,7 +1549,7 @@ class Pathname_Tests(unittest.TestCase):
         self.assertEqual(fn('//?/unc/server/share/dir'), '//server/share/dir')
         # Round-tripping
         urls = ['///C:',
-                '///folder/test/',
+                '/folder/test/',
                 '///C:/foo/bar/spam.foo']
         for url in urls:
             self.assertEqual(fn(urllib.request.url2pathname(url)), url)
@@ -1573,7 +1573,7 @@ class Pathname_Tests(unittest.TestCase):
         self.assertEqual(fn('/C|//'), 'C:\\\\')
         self.assertEqual(fn('///C|/path'), 'C:\\path')
         # No DOS drive
-        self.assertEqual(fn("///C/test/"), '\\\\\\C\\test\\')
+        self.assertEqual(fn("///C/test/"), '\\C\\test\\')
         self.assertEqual(fn("////C/test/"), '\\\\C\\test\\')
         # DOS drive paths
         self.assertEqual(fn('C:/path/to/file'), 'C:\\path\\to\\file')
@@ -1597,7 +1597,7 @@ class Pathname_Tests(unittest.TestCase):
         self.assertEqual(fn('//server/share/foo%2fbar'), '\\\\server\\share\\foo/bar')
         # Round-tripping
         paths = ['C:',
-                 r'\\\C\test\\',
+                 r'\C\test\\',
                  r'C:\foo\bar\spam.foo']
         for path in paths:
             self.assertEqual(fn(urllib.request.pathname2url(path)), path)
@@ -1608,8 +1608,8 @@ class Pathname_Tests(unittest.TestCase):
         fn = urllib.request.url2pathname
         self.assertEqual(fn('/foo/bar'), '/foo/bar')
         self.assertEqual(fn('//foo/bar'), '//foo/bar')
-        self.assertEqual(fn('///foo/bar'), '///foo/bar')
-        self.assertEqual(fn('////foo/bar'), '////foo/bar')
+        self.assertEqual(fn('///foo/bar'), '/foo/bar')
+        self.assertEqual(fn('////foo/bar'), '//foo/bar')
         self.assertEqual(fn('//localhost/foo/bar'), '//localhost/foo/bar')
 
 class Utility_Tests(unittest.TestCase):