Bug #6358. gc.DEBUG_OBJECTS removed from python3. Also handle exceptions due to collected weak references.

svn: r21299

gramps/plugins/tool/leak.py

@@ -99,7 +99,10 @@ class Leak(tool.Tool, ManagedWindow):
         self.list.append_column(column)
         self.selection = self.list.get_selection()
         
-        gc.set_debug(gc.DEBUG_UNCOLLECTABLE|gc.DEBUG_OBJECTS|gc.DEBUG_SAVEALL)
+        flags = gc.DEBUG_UNCOLLECTABLE|gc.DEBUG_SAVEALL
+        if hasattr(gc, "DEBUG_OBJECTS"):
+            flags = flags | gc.DEBUG_OBJECTS
+        gc.set_debug(flags)
 
         self.set_window(self.window, self.glade.get_object('title'),
                         self.title)
@@ -130,7 +133,10 @@ class Leak(tool.Tool, ManagedWindow):
             referrers = gc.get_referrers(self.modeldata[count])
             text = ""
             for referrer in referrers:
+                try:
                     text += str(referrer) + '\n'
+                except ReferenceError:
+                    pass
             InfoDialog(_('Referrers of %d') % count, text, 
                         parent=self.window)
 
@@ -141,7 +147,10 @@ class Leak(tool.Tool, ManagedWindow):
             referents = gc.get_referents(self.modeldata[count])
             text = ""
             for referent in referents:
+                try:
                     text += str(referent) + '\n'
+                except ReferenceError:
+                    pass
             InfoDialog(_('%d refers to') % count, text, 
                         parent=self.window)
 
@@ -157,6 +166,8 @@ class Leak(tool.Tool, ManagedWindow):
                 except DBError:
                     self.modeldata.append(each)
                     self.model.append((count, 'db.DB instance at %s' % id(each)))
+                except ReferenceError:
+                    pass
                 count += 1
         self.glade.get_object('label2').set_text(_('Uncollected Objects: %s') % str(len(gc.garbage)))