New submission from Rostyslav Dzinko: I've encountered that OverflowError which can happen in __len__ method is still undocumented, though one issue on this problem: http://bugs.python.org/issue12159 ended up with "need to be documented" comment. Link to documentation: http://docs.python.org/reference/datamodel.html#object.__len__ I think it must be clarified that __len__ return value is constrained to upper boundary (Py_ssize_t c type) when you plan to call it via len() built-in function. ---------- assignee: docs at python components: Documentation messages: 168439 nosy: Rostyslav.Dzinko, docs at python priority: normal severity: normal status: open title: Possible OverflowError in __len__ method undocumented (when called via len() function) versions: Python 2.7 _______________________________________ Python tracker <report at bugs.python.org> <http://bugs.python.org/issue15718> _______________________________________