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PyType_From*: Disallow metaclasses with custom tp_new #123909

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on Sep 10, 2024

Following up after #60074 and #103968:
In 3.14, the deprecation period is over and PyType_From* should fail if the metaclass has custom tp_new. That means the tp_new is no longer silently skipped.

The proper way to instantiate such a metaclass is to call it.

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encukou
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topic-C-API
on Sep 10, 2024
encukou
self-assigned this
on Sep 10, 2024
encukou
added 4 commits that reference this issue on Sep 11, 2024
pythongh-123909: PyType_From*: Disallow metaclasses with custom tp_new
a8c4375
pythongh-123909: PyType_From*: Disallow metaclasses with custom tp_new
4877284
pythongh-123909: PyType_From*: Disallow metaclasses with custom tp_new
111d364
gh-123909: PyType_From*: Disallow metaclasses with custom tp_new (GH-…
432bf31
encukou
closed this as completed on Sep 13, 2024
encukou
added 2 commits that reference this issue on Mar 20, 2025
pythongh-123909: Remove obsolete note in PyType_FromMetaclass
f35a82e
gh-123909: Remove obsolete note in PyType_FromMetaclass docs (GH-131506)
01ea4c7
diegorusso
added a commit that references this issue on Apr 1, 2025
pythongh-123909: Remove obsolete note in PyType_FromMetaclass docs (p…
15a5ad3

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