not x is None -> x is not None

gramps/gen/utils/callman.py

@@ -295,7 +295,7 @@ class CallbackManager(object):
         unconnect a signal from the database if it is already connected
         """
         oldcall, oldconnectkey = self.__callbacks[signal]
-        if not oldconnectkey is None:
+        if oldconnectkey is not None:
             self.database.disconnect(oldconnectkey)
 
     def add_db_signal(self, name, callback):

gramps/gui/editors/displaytabs/embeddedlist.py

@@ -581,7 +581,7 @@ class EmbeddedList(ButtonTab):
 
         self.tree.set_model(self.model)
         #reset previous select
-        if not selectedpath is None:
+        if selectedpath is not None:
             self.selection.select_path(selectedpath)
         #self.selection.select_path(node)
         self._set_label()

gramps/gui/editors/displaytabs/eventembedlist.py

@@ -413,5 +413,5 @@ class EventEmbedList(DbGUIElement, GroupEmbeddedList):
         @type prebuildpath: tree path
         """
         self.tree.expand_all()
-        if not prebuildpath is None:
+        if prebuildpath is not None:
             self.selection.select_path(prebuildpath)

gramps/gui/editors/displaytabs/nameembedlist.py

@@ -219,5 +219,5 @@ class NameEmbedList(GroupEmbeddedList):
         @type prebuildpath: tree path
         """
         self.tree.expand_all()
-        if not prebuildpath is None:
+        if prebuildpath is not None:
             self.selection.select_path(prebuildpath)

gramps/plugins/quickview/all_relations.py

@@ -234,7 +234,7 @@ class AllRelReport():
                                     relation[4], relation[2],
                                     only_birth = birth,
                                     in_law_a = inlawa, in_law_b = inlawb)
-            if not skip_list_text is None:
+            if skip_list_text is not None:
                 if rel_str in skip_list_text:
                     skip_list.append(count)
                 else: