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Author loewis
Recipients Arfrever, docs@python, loewis, max
Date 2012-09-21.11:37:37
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Message-id <>
The main point is: it depends on the operation. NotImplemented is a way to signal that an operation is not implemented. It can be used for whatever you want to use it for. You can design to call an operation "foo", and, if NotImplemented is returned, call "bar" instead.

If you want to know how a specific operation performs its fallback, you have to look in the documentation of the specific operation.

As an example for a method where some other fallback is used, see
Date User Action Args
2012-09-21 11:37:38loewissetrecipients: + loewis, Arfrever, docs@python, max
2012-09-21 11:37:38loewissetmessageid: <>
2012-09-21 11:37:38loewislinkissue15997 messages
2012-09-21 11:37:37loewiscreate