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gh-85795: Raise a clear error when super() is used in typing.NamedTuple subclasses #130082

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Merged
JelleZijlstra merged 3 commits into from
Mar 6, 2025
Merged

gh-85795: Raise a clear error when super() is used in typing.NamedTuple subclasses #130082

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ab6131d
Raise a clear error message when `__classcell__` is seen in `typing.N…
johnslavik Mar 4, 2025
8f2ebc8
Raise `TypeError` instead of `RuntimeError` if `__classcell__` is use…
johnslavik Mar 4, 2025
e5539be
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johnslavik Mar 4, 2025
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Raise TypeError instead of RuntimeError if __classcell__ is use… 
…d in typed namedtuples
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@johnslavik
johnslavik committed Mar 4, 2025
commit 8f2ebc8147e7d4ab70165fbc2032e6a054e1f1bd
8 changes: 4 additions & 4 deletions Doc/library/typing.rst
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Expand Up @@ -2359,10 +2359,6 @@ types.
# A functional syntax is also supported
Employee = NamedTuple('Employee', [('name', str), ('id', int)])

.. note::
Using :func:`super` (and the ``__class__`` :term:`closure variable`) in methods of ``NamedTuple`` subclasses
is unsupported and causes a :class:`RuntimeError`.

.. versionchanged:: 3.6
Added support for :pep:`526` variable annotation syntax.

Expand All @@ -2380,6 +2376,10 @@ types.
.. versionchanged:: 3.11
Added support for generic namedtuples.

.. versionchanged:: next
Using :func:`super` (and the ``__class__`` :term:`closure variable`) in methods of ``NamedTuple`` subclasses
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johnslavik marked this conversation as resolved.
is unsupported and causes a :class:`TypeError`.

.. deprecated-removed:: 3.13 3.15
The undocumented keyword argument syntax for creating NamedTuple classes
(``NT = NamedTuple("NT", x=int)``) is deprecated, and will be disallowed
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4 changes: 2 additions & 2 deletions Lib/test/test_typing.py
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Expand Up @@ -8365,12 +8365,12 @@ def test_super_explicitly_disallowed(self):
"in methods of NamedTuple subclasses"
)

with self.assertRaises(RuntimeError, msg=expected_message):
with self.assertRaises(TypeError, msg=expected_message):
class ThisWontWork(NamedTuple):
def __repr__(self):
return super().__repr__()

with self.assertRaises(RuntimeError, msg=expected_message):
with self.assertRaises(TypeError, msg=expected_message):
class ThisWontWorkEither(NamedTuple):
@property
def name(self):
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2 changes: 1 addition & 1 deletion Lib/typing.py
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Expand Up @@ -2962,7 +2962,7 @@ class NamedTupleMeta(type):
def __new__(cls, typename, bases, ns):
assert _NamedTuple in bases
if "__classcell__" in ns:
raise RuntimeError(
raise TypeError(
"uses of super() and __class__ are unsupported in methods of NamedTuple subclasses")
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johnslavik marked this conversation as resolved.
for base in bases:
if base is not _NamedTuple and base is not Generic:
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2 changes: 1 addition & 1 deletion Misc/NEWS.d/next/Library/2025-02-13-15-10-56.gh-issue-85795.jeXXI9.rst
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@@ -1,3 +1,3 @@
Using :func:`super` and ``__class__`` :term:`closure variable` in
user-defined methods of :class:`typing.NamedTuple` subclasses is now
explicitly prevented at runtime.
explicitly prohibited at runtime.