Don't use equality to check None

gramps/gui/utils.py

@@ -644,7 +644,7 @@ def model_to_text(model, cols=None, treeiter=None, indent="",
     text = ""
     if treeiter is None:
         treeiter = model.get_iter_first()
-    while treeiter != None:
+    while treeiter is not None:
         if cols is None:
             items = sep.join([str(item) for item in model[treeiter][:]])
         else:

gramps/gui/views/treemodels/flatbasemodel.py

@@ -854,7 +854,7 @@ class FlatBaseModel(GObject.GObject, Gtk.TreeModel, BaseModel):
         See Gtk.TreeModel
         """
         #print 'do_iter_nth_child', iter, nth
-        if iter == None:
+        if iter is None:
             return True, self.node_map.get_iter(nth)
         return False, None
 

gramps/gui/views/treemodels/treebasemodel.py

@@ -104,7 +104,7 @@ class Node(object):
         """
         Assign the handle of a Gramps object to this node.
         """
-        if not self.handle or handle == None:
+        if not self.handle or handle is None:
             self.handle = handle
             self.secondary = secondary
         else:

gramps/gui/widgets/grampletpane.py

@@ -162,7 +162,7 @@ def make_requested_gramplet(gui_class, pane, opts, dbstate, uistate):
     """
     Make a GUI gramplet given its name.
     """
-    if opts == None:
+    if opts is None:
         return None
 
     if "name" in opts:

gramps/plugins/database/bsddb_support/write.py

@@ -1819,7 +1819,7 @@ class DbBsddb(DbBsddbRead, DbWriteBase, UpdateCallback):
                     txn.delete(sname)
                 if group is not None:
                     txn.put(sname, group)
-            if group == None:
+            if group is None:
                 grouppar = ''
             else:
                 grouppar = group

gramps/plugins/lib/libsubstkeyword.py

@@ -1395,7 +1395,7 @@ if __name__ == '__main__':
     print("#None are known")
     tmp = main_level_test(consume_str, NameFormat, name_to_test)
     print(tmp)
-    print("Good" if tmp == None else "!! bad !!")
+    print("Good" if tmp is None else "!! bad !!")
 
 
     print()

gramps/plugins/webreport/webcal.py

@@ -963,9 +963,9 @@ class WebCalReport(Report):
                 continue
             for day in vals:
                 event_date = "%04d%02d%02d" % (year, month, day)
-                if evdte == None:
+                if evdte is None:
                     evdte = event_date
-                elif nxt == None:
+                elif nxt is None:
                     nxt = event_date
                     self.event_list.append((evdte, prv, nxt))
                 else:
@@ -1254,7 +1254,7 @@ class WebCalReport(Report):
                                                                        prefix = self.narweb_prefix)))
                         else:
                             text = short_name
-                        if age_at_death == None:
+                        if age_at_death is None:
                             self.add_day_item(text, year, month, day, 'Birthday', age_at_death, birth_date)
                         else:
                             self.add_day_item(text, year, month, day, 'Birthday', age_at_death, person_death)