bpo-40277: Add a repr() to namedtuple's _tuplegetter to aid with introspection (GH-19537)

1 files changed, 12 insertions, 0 deletions

diff --git a/Lib/test/test_collections.py b/Lib/test/test_collections.py
index 0207823f5a..a8d3337ef5 100644
--- a/Lib/test/test_collections.py
+++ b/Lib/test/test_collections.py
@@ -411,6 +411,18 @@ class TestNamedTuple(unittest.TestCase):
         self.assertIs(P.m.__doc__, Q.o.__doc__)
         self.assertIs(P.n.__doc__, Q.p.__doc__)
 
+    @support.cpython_only
+    def test_field_repr(self):
+        Point = namedtuple('Point', 'x y')
+        self.assertEqual(repr(Point.x), "_tuplegetter(0, 'Alias for field number 0')")
+        self.assertEqual(repr(Point.y), "_tuplegetter(1, 'Alias for field number 1')")
+
+        Point.x.__doc__ = 'The x-coordinate'
+        Point.y.__doc__ = 'The y-coordinate'
+
+        self.assertEqual(repr(Point.x), "_tuplegetter(0, 'The x-coordinate')")
+        self.assertEqual(repr(Point.y), "_tuplegetter(1, 'The y-coordinate')")
+
     def test_name_fixer(self):
         for spec, renamed in [
             [('efg', 'g%hi'),  ('efg', '_1')],                              # field with non-alpha char