Message 185523 - Python tracker

Message185523

Author	barry
Recipients	barry, docs@python
Date	2013-03-29.22:29:38
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1364596178.4.0.170619927624.issue17576@psf.upfronthosting.co.za>
In-reply-to

Content
You also end up with this nice bit of inconsistency: >>> x = myint(7) >>> from operator import index >>> range(10)[6:x] range(6, 7) >>> range(10)[6:x.__index__()] range(6, 8) >>> range(10)[6:index(x)] range(6, 7) >>> Granted, it's insane to have __index__() return a different value like this, but in my specific use case, it's the type of object returned from operator.index() that's the problem. operator.index() returns the subclass instance while obj.__index__() returns the int. (The use case is the IntEnum of PEP 435.)

Content

You also end up with this nice bit of inconsistency:

>>> x = myint(7)
>>> from operator import index
>>> range(10)[6:x]
range(6, 7)
>>> range(10)[6:x.__index__()]
range(6, 8)
>>> range(10)[6:index(x)]
range(6, 7)
>>> 

Granted, it's insane to have __index__() return a different value like this, but in my specific use case, it's the type of object returned from operator.index() that's the problem.  operator.index() returns the subclass instance while obj.__index__() returns the int.

(The use case is the IntEnum of PEP 435.)

History
Date	User	Action	Args
2013-03-29 22:29:38	barry	set	recipients: + barry, docs@python
2013-03-29 22:29:38	barry	set	messageid: <1364596178.4.0.170619927624.issue17576@psf.upfronthosting.co.za>
2013-03-29 22:29:38	barry	link	issue17576 messages
2013-03-29 22:29:38	barry	create