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"except" and "subclasscheck" changed between CPython2 and 3

On Sat, 03 Mar 2018 04:28:24 +0000, ???? wrote:

> Hello,
> I found a difference of behavior about `except` statement between
> CPython 2.7 and 3.x .
> `except EXC_CLASS:` calls `__subclasscheck__` in 2.7, but does not in
> 3.x .

Python 3 does not accept virtual subclasses for exception handling. They 
have to be concrete subclasses of BaseException.

There is a feature-request to support that (as Python 2.7 does):


but it is stalled.