pDictData, despite the name, is a list of 2-tuples where each 2-tuple is a dictionary object and a string.
Mar 12, 2022, 13:41 by ros...@gmail.com: > On Sun, 13 Mar 2022 at 08:25, Jen Kris via Python-list > <python-list@python.org> wrote: > >> PyObject* slice = PySlice_New(PyLong_FromLong(0), half_slice, 0); >> PyObject* subdata_a = PyObject_GetItem(pDictddata, slice); >> >> On the final line (subdata_a) I get a segfault. I know that the second >> parameter of PyObject_GetItem is a “key” and I suspect that’s where the >> problem comes from, but I don’t understand what a key is in this context. >> > > The key is simply whatever would be in the square brackets in Python > code, so that part looks fine. > > But dictionaries aren't usually subscripted with slices, so I'm a bit > confused as to what's going on here. What exactly is > dictdata/pDictdata? > > Have you confirmed that pDictdata (a) isn't NULL, (b) is the object > you intend it to be, and (c) contains the objects you expect it to? > The segfault might not be from the slice object itself, it might be > from actually iterating over the thing being sliced and touching all > its elements. For instance, if dictdata is actually a list, that call > will be constructing a new list with references to the same elements, > so if one of them is broken (maybe NULL), it'll break badly. > > ChrisA > -- > https://mail.python.org/mailman/listinfo/python-list > -- https://mail.python.org/mailman/listinfo/python-list
