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Created on 2019-04-25 14:52 by Michal Kononenko, last changed 2022-04-11 14:59 by admin. This issue is now closed.
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| msg340844 - (view) | Author: Michal Kononenko (Michal Kononenko) | Date: 2019-04-25 14:52 | |
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 |
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| msg340851 - (view) | Author: Brett Cannon (brett.cannon) *  |
Date: 2019-04-25 17:53 | |
There is probably validation code in len(), but the method itself can do whatever it wants if you call it directly. So the documentation is accurate in saying the method _should_ return >= 0 but that there's nothing strictly enforcing that in Python for that specific method when defined and called directly. |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:59:14 | admin | set | github: 80901 |
| 2019-04-25 17:53:14 | brett.cannon | set | status: open -> closed nosy: + brett.cannon messages: + msg340851 resolution: not a bug stage: resolved |
| 2019-04-25 14:52:18 | Michal Kononenko | create | |