Message 68990 - Python tracker

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In-reply-to
Author	jyasskin
Recipients	jyasskin, mato2000, werneck, zanella
Date	2008年06月30日.04:10:27
SpamBayes Score	0.0011394422
Marked as misclassified	No
Message-id	<1214799029.66.0.387501779067.issue2325@psf.upfronthosting.co.za>

Content
I don't think so. It wouldn't be a bug if I wrote: >>> class Meta(type): ... def __instancecheck__(self, other): ... return True >>> isinstance(3, Meta) ... False but it is a bug that the isinstance call raises an exception. If recent builds no longer raise an exception, then the bug should be closed. You guys also seem to have missed that the examples in PEP 3119 in fact define __instancecheck__ as a normal method on a metaclass (which makes it a classmethod on classes derived from that metaclass) instead of as a classmethod on a metaclass.

Content

I don't think so. It wouldn't be a bug if I wrote:
>>> class Meta(type):
... def __instancecheck__(self, other):
... return True
>>> isinstance(3, Meta)
... False
but it is a bug that the isinstance call raises an exception. If recent
builds no longer raise an exception, then the bug should be closed.
You guys also seem to have missed that the examples in PEP 3119 in fact
define __instancecheck__ as a normal method on a metaclass (which makes
it a classmethod on classes derived from that metaclass) instead of as a
classmethod on a metaclass.

History
Date	User	Action	Args
2008年06月30日 04:10:29	jyasskin	set	spambayes_score: 0.00113944 -> 0.0011394422 recipients: + jyasskin, zanella, werneck, mato2000
2008年06月30日 04:10:29	jyasskin	set	spambayes_score: 0.00113944 -> 0.00113944 messageid: <1214799029.66.0.387501779067.issue2325@psf.upfronthosting.co.za>
2008年06月30日 04:10:28	jyasskin	link	issue2325 messages
2008年06月30日 04:10:27	jyasskin	create

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