On 22.06.2018 22:17, Ivan Pozdeev wrote:
Now, I know this isn't what https://docs.python.org/3/glossary.html#term-sequence says. But practically, the documentation seems to use "sequence" in the sense "finite iterable". Functions that need to know the length of input in advance seem to be the minority.On 22.06.2018 22:07, Terry Reedy wrote:A practical sequence check is checking for __iter__ . An iterator doesn't necessarily have a defined length -- e.g. a stream or a generator.On 6/22/2018 7:17 AM, Christian Tismer wrote:It says that plainly: "The built-in function len() returns the number of items of a sequence. " https://docs.python.org/3/library/collections.abc.html#collections-abstract-base-classesMy problem is to find out how to deal with a class which has __getitem__ but no __len__. The documentation suggests that the length of a sequence can always be obtained by len(). https://docs.python.org/3/reference/datamodel.htmlsays that a Sequence has both __getitem__ and __len__.I am surprised that a C-API function calls something a 'sequence' without it having __len__.
-- Regards, Ivan _______________________________________________ Python-Dev mailing list [email protected] https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com