Sorry, I don't quite follow. On Thu, 21 Jun 2018 at 08:50 Christian Tismer <tis...@stackless.com> wrote:
> Hi friends, > > there is a case in the Python API where I am not sure what to do: > > If an object defines __getitem__() only but no __len__(), > then PySequence_Check() already is true and does not care. > Which matches https://docs.python.org/3/c-api/sequence.html#c.PySequence_Check . >From Objects/abstract.c: int PySequence_Check(PyObject *s) { if (PyDict_Check(s)) return 0; return s != NULL && s->ob_type->tp_as_sequence && s->ob_type->tp_as_sequence->sq_item != NULL; } > > So if I define no __len__, it simply fails. Is this intended? > What is "it" in this case that is failing? It isn't PySequence_Check() so I'm not sure what the issue is. -Brett > > I was mislead and thought this was the unlimited case, but > it seems still to be true that sequences are always finite. > > Can someone please enlighten me? > -- > Christian Tismer-Sperling :^) tis...@stackless.com > Software Consulting : http://www.stackless.com/ > Karl-Liebknecht-Str. 121 : http://pyside.org > 14482 Potsdam : GPG key -> 0xE7301150FB7BEE0E > phone +49 173 24 18 776 <+49%20173%202418776> fax +49 (30) 700143-0023 > <+49%2030%207001430023> > > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/brett%40python.org >
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