16     PyObject *keyfunc;  member
31     PyObject *it, *keyfunc = Py_None;  in groupby_new()  local
34                                      &it, &keyfunc))  in groupby_new()
43     gbo->keyfunc = keyfunc;  in groupby_new()
44     Py_INCREF(keyfunc);  in groupby_new()
58     Py_XDECREF(gbo->keyfunc);  in groupby_dealloc()
69     Py_VISIT(gbo->keyfunc);  in groupby_traverse()
85     if (gbo->keyfunc == Py_None) {  in groupby_step()
89         newkey = PyObject_CallFunctionObjArgs(gbo->keyfunc, newvalue, NULL);  in groupby_step()
149             lz->it, lz->keyfunc, lz->currkey, lz->currvalue, lz->tgtkey);  in groupby_reduce()
152             lz->it, lz->keyfunc);  in groupby_reduce()