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D0 Do not shadow user arguments in generated `__new__` by `@warnings.deprecated` · Issue #132159 · python/cpython · GitHub
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Do not shadow user arguments in generated __new__ by @warnings.deprecated #132159

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#132160
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Do not shadow user arguments in generated __new__ by @warnings.deprecated#132159
#132160
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stdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or error
@XuehaiPan

Description

@XuehaiPan
XuehaiPan
opened on Apr 6, 2025

Bug report

Bug description:

Follow comment #132055 (comment)

from warnings import deprecated


@deprecated("MyMeta will go away soon")
class MyMeta(type):
    def __new__(mcs, name, bases, attrs, cls=None):
        return super().__new__(mcs, name, bases, attrs)


class Foo(metaclass=MyMeta, cls='haha'):
    pass

Output:

$ python3 test.py
Traceback (most recent call last):
  File "/Users/PanXuehai/Projects/cpython/test.py", line 10, in <module>
    class Foo(metaclass=MyMeta, cls='haha'):
        pass
TypeError: MyMeta.__new__() got multiple values for argument 'cls'

CPython versions tested on:

3.13

Operating systems tested on:

macOS

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    stdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or error

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