gh-110275: Named tuple's __replace__() now raises TypeError for invalid arguments (GH-110299)

Author: serhiy-storchaka

Doc/library/collections.rst

@@ -981,6 +981,10 @@ field names, the method and attribute names start with an underscore.
 
     Named tuples are also supported by generic function :func:`copy.replace`.
 
+    .. versionchanged:: 3.13
+       Raise :exc:`TypeError` instead of :exc:`ValueError` for invalid
+       keyword arguments.
+
 .. attribute:: somenamedtuple._fields
 
     Tuple of strings listing the field names.  Useful for introspection

Lib/collections/__init__.py

@@ -457,7 +457,7 @@ def _make(cls, iterable):
     def _replace(self, /, **kwds):
         result = self._make(_map(kwds.pop, field_names, self))
         if kwds:
-            raise ValueError(f'Got unexpected field names: {list(kwds)!r}')
+            raise TypeError(f'Got unexpected field names: {list(kwds)!r}')
         return result
 
     _replace.__doc__ = (f'Return a new {typename} object replacing specified '

Lib/test/test_collections.py

@@ -488,12 +488,8 @@ def test_instance(self):
         self.assertEqual(p._replace(x=1), (1, 22))      # test _replace method
         self.assertEqual(p._asdict(), dict(x=11, y=22)) # test _asdict method
 
-        try:
+        with self.assertRaises(TypeError):
             p._replace(x=1, error=2)
-        except ValueError:
-            pass
-        else:
-            self._fail('Did not detect an incorrect fieldname')
 
         # verify that field string can have commas
         Point = namedtuple('Point', 'x, y')

Lib/test/test_copy.py

@@ -952,7 +952,7 @@ class PointFromClass(NamedTuple):
                 self.assertEqual(copy.replace(p, x=1), (1, 22))
                 self.assertEqual(copy.replace(p, y=2), (11, 2))
                 self.assertEqual(copy.replace(p, x=1, y=2), (1, 2))
-                with self.assertRaisesRegex(ValueError, 'unexpected field name'):
+                with self.assertRaisesRegex(TypeError, 'unexpected field name'):
                     copy.replace(p, x=1, error=2)
 
     def test_dataclass(self):

Misc/NEWS.d/next/Library/2023-11-08-16-11-04.gh-issue-110275.Bm6GwR.rst

@@ -0,0 +1,2 @@
+Named tuple's methods ``_replace()`` and ``__replace__()`` now raise
+TypeError instead of ValueError for invalid keyword arguments.