Message 308895 - Python tracker

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Author	chnlior
Recipients	chnlior, docs@python
Date	2017-12-21.18:57:04
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1513882624.99.0.213398074469.issue32400@psf.upfronthosting.co.za>
In-reply-to

Content
According to the c code in Include/descrobject.h #define PyDescr_IsData(d) (Py_TYPE(d)->tp_descr_set != NULL) and according to the "data model" chapter, a data descriptor is an object who has __set__ and /or __delete__. the "inspect.isdatadescriptor" checks for existence of __get__ and __set__ which IMHO is wrong. an object with __set__/__delete__ only will return falsely False (should be True). This is related to @Serhiy Storchaka comment in issue 26103 opened by @Aaron Hall.

According to the c code in Include/descrobject.h

#define PyDescr_IsData(d) (Py_TYPE(d)->tp_descr_set != NULL)

and according to the "data model" chapter,
a data descriptor is an object who has __set__ and /or __delete__.

the "inspect.isdatadescriptor" checks for existence of __get__ and __set__ which IMHO is wrong. an object with __set__/__delete__ only will return falsely False (should be True).  

This is related to @Serhiy Storchaka comment in issue 26103 opened by @Aaron Hall.

History
Date	User	Action	Args
2017-12-21 18:57:05	chnlior	set	recipients: + chnlior, docs@python
2017-12-21 18:57:04	chnlior	set	messageid: <1513882624.99.0.213398074469.issue32400@psf.upfronthosting.co.za>
2017-12-21 18:57:04	chnlior	link	issue32400 messages
2017-12-21 18:57:04	chnlior	create