refactor: rewire() now does 10 times the number of edges trials by de…

…fault

src/_igraph/graphobject.c

@@ -6409,7 +6409,7 @@ PyObject *igraphmodule_Graph_rewire(igraphmodule_GraphObject * self,
                                     PyObject * args, PyObject * kwds)
 {
   static char *kwlist[] = { "n", "mode", NULL };
-  Py_ssize_t n = 1000;
+  Py_ssize_t n = 10 * igraph_ecount(&self->g);
   PyObject *mode_o = Py_None;
   igraph_rewiring_t mode = IGRAPH_REWIRING_SIMPLE;
 
@@ -15779,12 +15779,13 @@ struct PyMethodDef igraphmodule_Graph_methods[] = {
   /* interface to igraph_rewire */
   {"rewire", (PyCFunction) igraphmodule_Graph_rewire,
    METH_VARARGS | METH_KEYWORDS,
-   "rewire(n=1000, mode=\"simple\")\n--\n\n"
+   "rewire(n=None, mode=\"simple\")\n--\n\n"
    "Randomly rewires the graph while preserving the degree distribution.\n\n"
-   "Please note that the rewiring is done \"in-place\", so the original\n"
-   "graph will be modified. If you want to preserve the original graph,\n"
-   "use the L{copy} method before.\n\n"
-   "@param n: the number of rewiring trials.\n"
+   "The rewiring is done \"in-place\", so the original graph will be modified.\n"
+   "If you want to preserve the original graph, use the L{copy} method before\n"
+   "rewiring.\n\n"
+   "@param n: the number of rewiring trials. The default is 10 times the number\n"
+   "  of edges.\n"
    "@param mode: the rewiring algorithm to use. It can either be C{\"simple\"} or\n"
    "  C{\"loops\"}; the former does not create or destroy loop edges while the\n"
    "  latter does.\n"},