(In reply to comment #0)
> b = Gtk.Button()
> b.set_label(1,2,3)
> 
> before: TypeError: set_label() takes exactly 2 arguments (4 given)
> after:  TypeError: Gtk.Button.set_label() takes exactly 2 arguments (4 given)

I'd like to add that Python itself only prints the function name in this case, so the new behavior is inconsistent. I personally like the additional info, but if consistency is preferred I'm happy to revert those cases.

Review of attachment 295363 [details] [review]:

Looks good, just some minor style nitpicks.

::: gi/pygi-cache.c
@@ +668,3 @@
     cache->name = g_base_info_get_name ((GIBaseInfo *) callable_info);
+    cache->namespace = g_base_info_get_namespace ((GIBaseInfo *) callable_info);
+    container = g_base_info_get_container((GIBaseInfo *) callable_info);

Space needed after function name and before open parenthesis.

@@ +671,3 @@
+    cache->container_name = NULL;
+    /* https://bugzilla.gnome.org/show_bug.cgi?id=709456 */
+    if (container != NULL && g_base_info_get_type(container) != GI_INFO_TYPE_TYPE) {

here too

@@ +679,3 @@
         const gchar *deprecated = g_base_info_get_attribute (callable_info, "deprecated");
         gchar *warning;
+        gchar *full_name = pygi_callable_cache_get_full_name(cache);

same

@@ +711,3 @@
+{
+    if (cache->container_name != NULL) {
+        return g_strjoin(".",

same

@@ +717,3 @@
+                         NULL);
+    } else {
+        return g_strjoin(".",

same

Created attachment 295564 [details] [review]
patch v2

Thanks!

Review of attachment 295564 [details] [review]:

LGTM, Thanks!