[issue10011] `except` doesn't use `isinstance`

[Ram Rachum]

New submission from Ram Rachum <cool-rr at cool-rr.com>:

Is there a reason why `execpt` compares base classes instead of using `isinstance`? This prevents using `__instancecheck__` to override the instance check.

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components: Interpreter Core
messages: 117844
nosy: cool-RR
priority: normal
severity: normal
status: open
title: `except` doesn't use `isinstance`
versions: Python 2.5, Python 2.6, Python 2.7, Python 3.1, Python 3.2, Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10011>
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