Fix error on POSIX

Author: danny0838

Lib/test/test_zipfile/test_core.py

@@ -4830,25 +4830,25 @@ def test_overlap_with_archive_comment(self):
     def test_append_keep_filename(self):
         """Files loaded from an archive should keep original filename when
         rewritten to central directory in append mode."""
-        with mock.patch('os.sep', '/'), mock.patch('os.altsep', None), \
-             zipfile.ZipFile(TESTFN, mode="w") as zipfp:
-            zinfo = zipfile.ZipInfo('MyFolder/My\\File.txt')
-            zipfp.writestr(zinfo, 'foo')
-
-        with mock.patch('os.sep', '\\'), mock.patch('os.altsep', '/'), \
-             zipfile.ZipFile(TESTFN, "a") as zipfp:
-            zi = zipfp.infolist()[0]
-            self.assertEqual(zi.orig_filename, 'MyFolder/My\\File.txt')
-            self.assertEqual(zi.filename, 'MyFolder/My/File.txt')
-            self.assertIsNone(zipfp.testzip())
-            # trigger archive rewriting
-            zipfp.comment = b''
-
-        with zipfile.ZipFile(TESTFN, "r") as zipfp:
-            zi = zipfp.infolist()[0]
-            self.assertEqual(zi.orig_filename, 'MyFolder/My\\File.txt')
-            self.assertEqual(zi.filename, 'MyFolder/My/File.txt')
-            self.assertIsNone(zipfp.testzip())
+        with mock.patch('os.sep', '/'), mock.patch('os.altsep', None):
+            with zipfile.ZipFile(TESTFN, mode="w") as zipfp:
+                zinfo = zipfile.ZipInfo('MyFolder/My\\File.txt')
+                zipfp.writestr(zinfo, 'foo')
+
+        with mock.patch('os.sep', '\\'), mock.patch('os.altsep', '/'):
+            with zipfile.ZipFile(TESTFN, "a") as zipfp:
+                zi = zipfp.infolist()[0]
+                self.assertEqual(zi.orig_filename, 'MyFolder/My\\File.txt')
+                self.assertEqual(zi.filename, 'MyFolder/My/File.txt')
+                self.assertIsNone(zipfp.testzip())
+                # trigger archive rewriting
+                zipfp.comment = b''
+
+            with zipfile.ZipFile(TESTFN, "r") as zipfp:
+                zi = zipfp.infolist()[0]
+                self.assertEqual(zi.orig_filename, 'MyFolder/My\\File.txt')
+                self.assertEqual(zi.filename, 'MyFolder/My/File.txt')
+                self.assertIsNone(zipfp.testzip())
 
     def tearDown(self):
         unlink(TESTFN)