Message 364849 - Python tracker

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Author	pwuertz
Recipients	pwuertz
Date	2020-03-23.14:34:33
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1584974073.92.0.811600975239.issue40047@roundup.psfhosted.org>
In-reply-to

Content
Itertools `tee` does not seem to de-reference yielded items, even after consumption of all items from all tee-iterators. According to the documentation (to my understanding), there shouldn't be any extra memory requirement as long as the tee-iterators are consumed in a balanced way. I.e. after an item was pulled from all iterators there shouldn't be any residual reference to it. This is true for the example-implementation mentioned in the documentation, but `itertools.tee` doesn't de-reference items until the tee-iterator itself is deleted: https://pastebin.com/r3JUkH41 Is this a bug or am I missing something?

Itertools `tee` does not seem to de-reference yielded items, even after consumption of all items from all tee-iterators.

According to the documentation (to my understanding), there shouldn't be any extra memory requirement as long as the tee-iterators are consumed in a balanced way. I.e. after an item was pulled from all iterators there shouldn't be any residual reference to it.

This is true for the example-implementation mentioned in the documentation, but `itertools.tee` doesn't de-reference items until the tee-iterator itself is deleted:

https://pastebin.com/r3JUkH41

Is this a bug or am I missing something?

History
Date	User	Action	Args
2020-03-23 14:34:33	pwuertz	set	recipients: + pwuertz
2020-03-23 14:34:33	pwuertz	set	messageid: <1584974073.92.0.811600975239.issue40047@roundup.psfhosted.org>
2020-03-23 14:34:33	pwuertz	link	issue40047 messages
2020-03-23 14:34:33	pwuertz	create