Message 258542 - Python tracker (original) (raw)

Message258542

Author	serhiy.storchaka
Recipients	benjamin.peterson, brett.cannon, georg.brandl, ncoghlan, rhettinger, serhiy.storchaka, vstinner, yselivanov
Date	2016-01-18.20:09:48
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	1453147788.86.0.284579420871.issue26148@psf.upfronthosting.co.za
In-reply-to

Content
Usually string literals are interned. But not if they are a part of constant tuple. >>> def abc(): pass ... >>> x = 'abc' >>> x is abc.__name__ True >>> x = ('abc',) >>> x[0] is abc.__name__ False This makes effect on namedtuples (). May make effect on __slots__ or other uses of constant tuples since searching a value in a tuple when values are not identical is a little slower that when they are identical.

Content

Usually string literals are interned. But not if they are a part of constant tuple. >>> def abc(): pass ... >>> x = 'abc' >>> x is abc.__name__ True >>> x = ('abc',) >>> x[0] is abc.__name__ False This makes effect on namedtuples (). May make effect on __slots__ or other uses of constant tuples since searching a value in a tuple when values are not identical is a little slower that when they are identical.

History
Date	User	Action	Args
2016-01-18 20:09:48	serhiy.storchaka	set	recipients: + serhiy.storchaka, brett.cannon, georg.brandl, rhettinger, ncoghlan, vstinner, benjamin.peterson, yselivanov
2016-01-18 20:09:48	serhiy.storchaka	set	messageid: 1453147788.86.0.284579420871.issue26148@psf.upfronthosting.co.za
2016-01-18 20:09:48	serhiy.storchaka	link	issue26148 messages
2016-01-18 20:09:48	serhiy.storchaka	create