diff --git a/src/calibre/gui2/actions/copy_to_library.py b/src/calibre/gui2/actions/copy_to_library.py
index ff264b00f9..a6801b2198 100644
--- a/src/calibre/gui2/actions/copy_to_library.py
+++ b/src/calibre/gui2/actions/copy_to_library.py
@@ -298,7 +298,10 @@ class ChooseLibrary(Dialog):  # {{{
         v.addWidget(sa)
         sa.setChecked(bool(gprefs.get('copy_to_library_choose_library_sort_alphabetically', True)))
         sa.stateChanged.connect(self.resort)
-        sa.stateChanged.connect(lambda: gprefs.set('copy_to_library_choose_library_sort_alphabetically', bool(self.sort_alphabetically.isChecked())))
+
+        connect_lambda(sa.stateChanged, self, lambda self:
+                gprefs.set('copy_to_library_choose_library_sort_alphabetically',
+                bool(self.sort_alphabetically.isChecked())))
         la = self.la = QLabel(_('Library &path:'))
         v.addWidget(la)
         le = self.le = QLineEdit(self)
diff --git a/src/calibre/gui2/actions/mark_books.py b/src/calibre/gui2/actions/mark_books.py
index 90946d6203..3de994a6bd 100644
--- a/src/calibre/gui2/actions/mark_books.py
+++ b/src/calibre/gui2/actions/mark_books.py
@@ -61,14 +61,14 @@ class MarkBooksAction(InterfaceAction):
         a.triggered.connect(self.clear_all_marked)
         m.addSeparator()
         self.mark_author_action = a = ma('mark-author', _('Mark all books by selected author(s)'), icon='plus.png')
-        a.triggered.connect(partial(self.mark_field, 'authors', True))
+        connect_lambda(a.triggered, self, lambda self: self.mark_field('authors', True))
         self.mark_series_action = a = ma('mark-series', _('Mark all books in the selected series'), icon='plus.png')
-        a.triggered.connect(partial(self.mark_field, 'series', True))
+        connect_lambda(a.triggered, self, lambda self: self.mark_field('series', True))
         m.addSeparator()
         self.unmark_author_action = a = ma('unmark-author', _('Clear all books by selected author(s)'), icon='minus.png')
-        a.triggered.connect(partial(self.mark_field, 'authors', False))
+        connect_lambda(a.triggered, self, lambda self: self.mark_field('authors', False))
         self.unmark_series_action = a = ma('unmark-series', _('Clear all books in the selected series'), icon='minus.png')
-        a.triggered.connect(partial(self.mark_field, 'series', False))
+        connect_lambda(a.triggered, self, lambda self: self.mark_field('series', False))
 
     def gui_layout_complete(self):
         for x in self.gui.bars_manager.main_bars + self.gui.bars_manager.child_bars:
@@ -138,4 +138,3 @@ class MarkBooksAction(InterfaceAction):
             else:
                 mids.pop(book_id, None)
         db.data.set_marked_ids(mids)
-
diff --git a/src/calibre/gui2/tweak_book/diff/main.py b/src/calibre/gui2/tweak_book/diff/main.py
index 7549b9e48a..6b872327c0 100644
--- a/src/calibre/gui2/tweak_book/diff/main.py
+++ b/src/calibre/gui2/tweak_book/diff/main.py
@@ -239,14 +239,14 @@ class Diff(Dialog):
         r = l.rowCount()
         self.bp = b = QToolButton(self)
         b.setIcon(QIcon(I('back.png')))
-        b.clicked.connect(partial(self.view.next_change, -1))
+        connect_lambda(b.clicked, self, lambda self: self.view.next_change(-1))
         b.setToolTip(_('Go to previous change') + ' [p]')
         b.setText(_('&Previous change')), b.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
         l.addWidget(b, r, 0)
 
         self.bn = b = QToolButton(self)
         b.setIcon(QIcon(I('forward.png')))
-        b.clicked.connect(partial(self.view.next_change, 1))
+        connect_lambda(b.clicked, self, lambda self: self.view.next_change(1))
         b.setToolTip(_('Go to next change') + ' [n]')
         b.setText(_('&Next change')), b.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
         l.addWidget(b, r, 1)
@@ -255,16 +255,16 @@ class Diff(Dialog):
         s.initialize('diff_search_history')
         l.addWidget(s, r, 2)
         s.setPlaceholderText(_('Search for text'))
-        s.returnPressed.connect(partial(self.do_search, False))
+        connect_lambda(s.returnPressed, self, lambda self: self.do_search(False))
         self.sbn = b = QToolButton(self)
         b.setIcon(QIcon(I('arrow-down.png')))
-        b.clicked.connect(partial(self.do_search, False))
+        connect_lambda(b.clicked, self, lambda self: self.do_search(False))
         b.setToolTip(_('Find next match'))
         b.setText(_('Next &match')), b.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
         l.addWidget(b, r, 3)
         self.sbp = b = QToolButton(self)
         b.setIcon(QIcon(I('arrow-up.png')))
-        b.clicked.connect(partial(self.do_search, True))
+        connect_lambda(b.clicked, self, lambda self: self.do_search(True))
         b.setToolTip(_('Find previous match'))
         b.setText(_('P&revious match')), b.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
         l.addWidget(b, r, 4)