Re: [Python-ideas] Allow isinstance second argument to be a set of types

Date	2011-07-04 20:53 +0100
From	MRAB <python@mrabarnett.plus.com>
Subject	Re: [Python-ideas] Allow isinstance second argument to be a set of types
References	(3 earlier) <20110704172843.50c5b445@pitrou.net> <CAGE7PN+KBhEUg=KOxOBaF2=EEQ=Jt=Erq=si1cmYur8TbKtHuw@mail.gmail.com> <CAGE7PNJV0u_4KuQY8ShYpZCnXwEYUhHYAcxRwi6nXTGHgeYxmg@mail.gmail.com> <1309802125.3688.54.camel@localhost.localdomain> <CAGmFidbVGr-sVAzSgXu0SR5cjZgUGbhZBNqSAuWjJNOkjnL3qg@mail.gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.604.1309809227.1164.python-list@python.org> (permalink)

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On 04/07/2011 20:41, Amaury Forgeot d'Arc wrote:
> Hi,
>
> 2011/7/4 Antoine Pitrou<solipsis@pitrou.net>:
>> Le lundi 04 juillet 2011 à 10:52 -0700, Gregory P. Smith a écrit :
>>> note that a fast lookup implies exact type and not subclass making my
>>> point silly... at which point you're back to iterating so I suspect
>>> supporting arbitrary iterables is actually how this will be
>>> implemented regardless.
>>
>> Indeed. Note that the tuple case should remain fast, and therefore
>> special-cased (or the general list/tuple case, since the difference in C
>> is rather small).
>
> Arbitrary iterables, arbitrarily nested...
> beware of objects which are also their first element, like str('a')...
>
Probably not arbitrarily nested, just a type (type(t) is type) or an
iterable yielding types. Anything else would raise an exception.

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Re: [Python-ideas] Allow isinstance second argument to be a set of types MRAB <python@mrabarnett.plus.com> - 2011-07-04 20:53 +0100

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