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GeezerVison is showing github.com — gh-100530: Change the error message for `MatchClass` by sobolevn · Pull Request #103576 · python/cpython Conversation
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carljm
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Apr 20, 2023
* main: (24 commits) pythongh-98040: Move the Single-Phase Init Tests Out of test_imp (pythongh-102561) pythongh-83861: Fix datetime.astimezone() method (pythonGH-101545) pythongh-102856: Clean some of the PEP 701 tokenizer implementation (python#103634) pythongh-102856: Skip test_mismatched_parens in WASI builds (python#103633) pythongh-102856: Initial implementation of PEP 701 (python#102855) pythongh-103583: Add ref. dependency between multibytecodec modules (python#103589) pythongh-83004: Harden msvcrt further (python#103420) pythonGH-88342: clarify that `asyncio.as_completed` accepts generators yielding tasks (python#103626) pythongh-102778: IDLE - make sys.last_exc available in Shell after traceback (python#103314) pythongh-103582: Remove last references to `argparse.REMAINDER` from docs (python#103586) pythongh-103583: Always pass multibyte codec structs as const (python#103588) pythongh-103617: Fix compiler warning in _iomodule.c (python#103618) pythongh-103596: [Enum] do not shadow mixed-in methods/attributes (pythonGH-103600) pythonGH-100530: Change the error message for non-class class patterns (pythonGH-103576) pythongh-95299: Remove lingering setuptools reference in installer scripts (pythonGH-103613) [Doc] Fix a typo in optparse.rst (python#103504) pythongh-101100: Fix broken reference `__format__` in `string.rst` (python#103531) pythongh-95299: Stop installing setuptools as a part of ensurepip and venv (python#101039) pythonGH-103484: Docs: add linkcheck allowed redirects entries for most cases (python#103569) pythongh-67230: update whatsnew note for csv changes (python#103598) ...
sharkdp
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Feb 11, 2026
When trying to use a class pattern to match on a non-class object, we
currently get the following error message:
Traceback (most recent call last):
File "/tmp/test.py", line 2, in <module>
case len():
~~~^^
TypeError: called match pattern must be a class
The terminology "called match pattern" here is a bit confusing. It's not
used anywhere else as far as I can tell, and for a beginner, it might
read like something is actually being called here.
The documentation consistently refers to these patterns as "class
patterns":
* https://docs.python.org/3/reference/compound_stmts.html#class-patterns
* https://peps.python.org/pep-0635/#class-patterns
* https://docs.python.org/3/library/ast.html#ast.MatchClass
* https://docs.python.org/3/reference/datamodel.html#customizing-positional-arguments-in-class-pattern-matching
I am therefore suggesting to change the message to "class pattern must
refer to a class".
See python#103576 for a PR that
previously changed this message (from "… must be a type" to "… must be a
class").
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