New submission from Karthikeyan Singaravelan <tir.kar...@gmail.com>:
As reported by Serhiy on https://bugs.python.org/issue37555#msg347733 there is a difference in __eq__ definition in datetime module's C and Python implementation for timedelta and time. When the other in __eq__ is not of the same type NotImplemented is not returned in Python implementation like C causing equality to behave differently. Difference in C implementation and Python implementation for datetime.timedelta.__eq__ https://github.com/python/cpython/blob/c8e7146de257930ea8d0d4aa74b3a64fcaa79d4b/Modules/_datetimemodule.c#L2152 static PyObject * delta_richcompare(PyObject *self, PyObject *other, int op) { if (PyDelta_Check(other)) { int diff = delta_cmp(self, other); return diff_to_bool(diff, op); } else { Py_RETURN_NOTIMPLEMENTED; } } https://github.com/python/cpython/blob/c8e7146de257930ea8d0d4aa74b3a64fcaa79d4b/Lib/datetime.py#L732 def __eq__(self, other): if isinstance(other, timedelta): return self._cmp(other) == 0 else: return False I will add a PR for this with test. ---------- components: Library (Lib) messages: 347773 nosy: belopolsky, p-ganssle, serhiy.storchaka, xtreak priority: normal severity: normal status: open title: Difference in equality check between C and Python implementation for datetime module's timedelta and time type: behavior versions: Python 3.7, Python 3.8, Python 3.9 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue37579> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
