[issue31506] Improve the error message logic for object_new & object_init

[Nick Coghlan]

Nick Coghlan added the comment:

For this issue, I'm not proposing to make any change other than to solve the specific problem reported in the blog post: when the method itself isn't overridden, then the error message should report the name of the most derived class, not "object", to help users more readily find the likely source of their problem (a missing "__init__" method definition).

Making these custom errors consistent with Python 3's otherwise improved argument unpacking errors would be a separate issue (and I agree *that* change wouldn't qualify as being easy).

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31506>
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