[issue12029] ABC registration of Exceptions

James Henstridge added the comment: The documentation for ABCMeta.register() says that it makes the other class a "virtual subclass". That would make the ABC a "virtual base class". So whether the current behaviour is correct depends on whether you consider a "virtual base" to count as a bas

[issue12029] ABC registration of Exceptions

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[issue12029] ABC registration of Exceptions

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[issue12029] ABC registration of Exceptions

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[issue12029] ABC registration of Exceptions

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[issue12029] ABC registration of Exceptions

Chris Rebert added the comment: Surveying the docs, the current behavior *is* /technically/ correct (in a suspiciously precise way) according to the Language Reference: http://docs.python.org/dev/reference/compound_stmts.html#grammar-token-try_stmt : "For an except clause with an expression [.

[issue12029] ABC registration of Exceptions

Chris Rebert added the comment: Scouting around the CPython codebase a bit, I speculate that the cause of this behavior is that PyErr_GivenExceptionMatches() in errors.c uses PyType_IsSubtype() [which simply walks a class's __mro__ checking for pointer equality] rather than PyObject_IsSubclas

[issue12029] ABC registration of Exceptions

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[issue12029] ABC registration of Exceptions

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[issue12029] ABC registration of Exceptions

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[issue12029] ABC registration of Exceptions

New submission from andrew cooke : Hi, In general, registering a class with an ABC is equivalent to making it a subclass (isinstance and issubclass are patched through ABCMeta). However, this does not work for exceptions (see example below, where exception is not caught). This doesn't seem