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

[Youta TAKAOKA]

Thank you, Steven.

> There is a feature-request to support that (as Python 2.7 does):
>
> https://bugs.python.org/issue12029
>
> but it is stalled.

I passed over the ticket.

Now, I know that this is a bug, but has not fixed yet.
There are (or ware ?) problems about performance and integrity for handling
exceptions.

It seems that a narrow range of use-cases cause the stalling.
Someday we have a type-focused VERY NICE library, (I hope that) it will be
resolved.

Thanks.

--
youta.t at gmail.com