There are many tutorials and examples out there on how to perform date-arithmetic from Python. But I cannot find anything for the Python C API... My C function, callable from Python, operates on two dates: start and finish. If start is not explicitly specified, it must be understood as one day before the finish. How do I do this? /* Attempt converting the finish-date, if not a date already */ if (!PyDate_Check(finishO)) { o = PyDate_FromTimestamp(finishO); if (o == NULL) return PyErr_Format(PyExc_ValueError, "%R is not a valid date", finishO); finishO = o; } /* If start-date is not specified, assume one day prior the finish date */ if (startO == NULL) { PyObject *oneDay = PyDelta_FromDSU(1, 0, 0); /* Derive startO from finishO by applying the one-day delta somehow */ } Continue reading...
