bpo-9372: Deprecate several __getitem__ methods (GH-8609)

The __getitem__ methods of DOMEventStream, FileInput,
and FileWrapper classes ignore their 'index' parameters
and return the next item instead.

1 files changed, 10 insertions, 0 deletions

diff --git a/Lib/test/test_fileinput.py b/Lib/test/test_fileinput.py
index c97bb4c..c5d722e 100644
--- a/Lib/test/test_fileinput.py
+++ b/Lib/test/test_fileinput.py
@@ -351,6 +351,7 @@ class FileInputTests(BaseTests, unittest.TestCase):
         with FileInput(files=[]) as fi:
             self.assertEqual(fi._files, ('-',))
 
+    @support.ignore_warnings(category=DeprecationWarning)
     def test__getitem__(self):
         """Tests invoking FileInput.__getitem__() with the current
            line number"""
@@ -361,6 +362,14 @@ class FileInputTests(BaseTests, unittest.TestCase):
             retval2 = fi[1]
             self.assertEqual(retval2, "line2\n")
 
+    def test__getitem___deprecation(self):
+        t = self.writeTmp("line1\nline2\n")
+        with self.assertWarnsRegex(DeprecationWarning,
+                                   r'Use iterator protocol instead'):
+            with FileInput(files=[t]) as fi:
+                self.assertEqual(fi[0], "line1\n")
+
+    @support.ignore_warnings(category=DeprecationWarning)
     def test__getitem__invalid_key(self):
         """Tests invoking FileInput.__getitem__() with an index unequal to
            the line number"""
@@ -370,6 +379,7 @@ class FileInputTests(BaseTests, unittest.TestCase):
                 fi[1]
         self.assertEqual(cm.exception.args, ("accessing lines out of order",))
 
+    @support.ignore_warnings(category=DeprecationWarning)
     def test__getitem__eof(self):
         """Tests invoking FileInput.__getitem__() with the line number but at
            end-of-input"""