Message 340844 - Python tracker

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Author	Michal Kononenko
Recipients	Michal Kononenko, docs@python
Date	2019-04-25.14:52:18
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1556203938.29.0.467406560077.issue36720@roundup.psfhosted.org>
In-reply-to

Content
The link below defines __len__ https://docs.python.org/3/reference/datamodel.html?highlight=__len__#object.__len__ However, I was reading in the StackOverflow thread below that CPython does some validation to check that the return value of __len__ should be >= 0. Does this mean that len must return a value >= 0, in the RFC 2119 sense of the word? https://stackoverflow.com/questions/42521449/how-does-python-ensure-the-return-value-of-len-is-an-integer-when-len-is-cal

The link below defines __len__

https://docs.python.org/3/reference/datamodel.html?highlight=__len__#object.__len__

However, I was reading in the StackOverflow thread below that CPython does some validation to check that the return value of __len__ should be >= 0. Does this mean that len must return a value >= 0, in the RFC 2119 sense of the word?

https://stackoverflow.com/questions/42521449/how-does-python-ensure-the-return-value-of-len-is-an-integer-when-len-is-cal

History
Date	User	Action	Args
2019-04-25 14:52:18	Michal Kononenko	set	recipients: + Michal Kononenko, docs@python
2019-04-25 14:52:18	Michal Kononenko	set	messageid: <1556203938.29.0.467406560077.issue36720@roundup.psfhosted.org>
2019-04-25 14:52:18	Michal Kononenko	link	issue36720 messages
2019-04-25 14:52:18	Michal Kononenko	create