diff --git a/src/gourmet/Undo.py b/src/gourmet/Undo.py
index 85ad7aca..60469d94 100644
--- a/src/gourmet/Undo.py
+++ b/src/gourmet/Undo.py
@@ -363,6 +363,7 @@ def get_text (self):
         return self.buffer.get_text(self.buffer.get_start_iter(),
                                     self.buffer.get_end_iter())
 
+
 class UndoHistoryList (list):
     """An UndoHistoryList."""
     def __init__ (self, undo_widget, redo_widget, reapply_widget=None, signal='activate'):
@@ -426,13 +427,14 @@ def reapply (self, *args):
         action.reapply()
         for h in self.action_hooks: h(self,action,'reapply')
 
-    def set_sensitive (self,w,val):
-        debug('set_sensitive',0)
+    def set_sensitive (self, w: Gtk.Action, is_sensitive: bool):
+        # FIXME: this function should not exist.
+        # It's only here to deal with the case where self.reapply_widget is
+        # None. This function is only used within this object.
+        debug('set_sensitive', 0)
         if not w:
-            #import traceback; traceback.print_stack()
-            #print 'No widget to sensitize',w,val
             return
-        w.set_sensitive(val)
+        w.set_sensitive(is_sensitive)
 
     def gui_update (self):
         debug('gui_update',0)
diff --git a/src/gourmet/reccard.py b/src/gourmet/reccard.py
index 89a2a74d..901dfd11 100644
--- a/src/gourmet/reccard.py
+++ b/src/gourmet/reccard.py
@@ -640,9 +640,7 @@ def update_yields_multiplier (self, val):
     def forget_remembered_optional_ingredients (self):
         pass
 
-    def offer_url (self, label, url, from_thread=False):
-        if from_thread:
-            gt.gtk_enter()
+    def offer_url (self, label, url):
         if hasattr(self,'progress_dialog'):
             self.hide_progress_dialog()
         # Clear existing messages...
@@ -651,16 +649,16 @@ def offer_url (self, label, url, from_thread=False):
         # Add new message
         l = Gtk.Label()
         l.set_markup(label)
-        l.connect('activate-link',lambda lbl, uri: webbrowser.open_new_tab(uri))
+        l.connect('activate-link', lambda lbl,
+                  uri: webbrowser.open_new_tab(uri))
         infobar = Gtk.InfoBar()
         infobar.set_message_type(Gtk.MessageType.INFO)
         infobar.get_content_area().add(l)
         infobar.add_button(Gtk.STOCK_CLOSE, Gtk.ResponseType.CLOSE)
-        infobar.connect('response', lambda ib, response_id: self.messagebox.hide())
+        infobar.connect('response',
+                        lambda ib, response_id: self.messagebox.hide())
         self.messagebox.pack_start(infobar, True, True, 0)
         self.messagebox.show_all()
-        if from_thread:
-            gt.gtk_leave()
 
 
 class IngredientDisplay:
@@ -1029,7 +1027,8 @@ def save_cb (self, *args):
         self.rg.rd.update_hashes(self.current_rec)
         self.rg.rmodel.update_recipe(self.current_rec)
         if 'title' in newdict:
-            self.window.set_title("%s %s"%(self.edit_title,self.current_rec.title.strip()))
+            self.window.set_title(f'{self.edit_title} '
+                                  f'{self.current_rec.title.strip()}')
         self.set_edited(False)
         self.reccard.new = False
         self.reccard.update_recipe(self.current_rec) # update display (if any)
diff --git a/src/gourmet/recindex.py b/src/gourmet/recindex.py
index ad7679a4..f901da15 100644
--- a/src/gourmet/recindex.py
+++ b/src/gourmet/recindex.py
@@ -1,6 +1,6 @@
 from gettext import gettext as _
 from gettext import ngettext
-from typing import List, Union
+from typing import List, Tuple, Union
 
 from gi.repository import Gdk, GdkPixbuf, GObject, Gtk, Pango
 
@@ -244,7 +244,8 @@ def rmodel_page_changed_cb (self, rmodel):
             self.last_button.set_sensitive(True)
         self.set_reccount()
 
-    def rmodel_sort_cb(self, rmodel, sorts):
+    def rmodel_sort_cb(self, rmodel: 'RecipeModel',
+                       sorts: List[Tuple[str, int]]):
         self.sort_by = sorts
         self.last_search = {}
         self.search()