Message5179

Author	thobes
Recipients	asnama, fwierzbicki, thobes
Date	2009-09-17.08:18:11
SpamBayes Score	2.497904e-07
Marked as misclassified	No
Message-id	<1253175492.05.0.175958459128.issue1471@psf.upfronthosting.co.za>
In-reply-to

Content
It's even wrong to use 'is' for comparing integers in CPython, even regular integers (as opposed to long integers), try the following in CPython: >>> a = 1<<10 >>> b = 1<<10 >>> a is b False This would however be True for small integers in both CPython and Jython, since both implementations have a "small integer cache": >>> a = 1 << 8 >>> b = 1 << 8 >>> a is b True But again, this is not something you should rely on.

It's even wrong to use 'is' for comparing integers in CPython, even
regular integers (as opposed to long integers), try the following in
CPython:
>>> a = 1<<10
>>> b = 1<<10
>>> a is b
False

This would however be True for small integers in both CPython and
Jython, since both implementations have a "small integer cache":
>>> a = 1 << 8
>>> b = 1 << 8
>>> a is b
True

But again, this is not something you should rely on.

History
Date	User	Action	Args
2009-09-17 08:18:12	thobes	set	messageid: <1253175492.05.0.175958459128.issue1471@psf.upfronthosting.co.za>
2009-09-17 08:18:12	thobes	set	recipients: + thobes, fwierzbicki, asnama
2009-09-17 08:18:12	thobes	link	issue1471 messages
2009-09-17 08:18:11	thobes	create