diff --git a/src/calibre/gui2/tweak_book/preferences.py b/src/calibre/gui2/tweak_book/preferences.py
index 2a2bb3f4ab..059414c9a6 100644
--- a/src/calibre/gui2/tweak_book/preferences.py
+++ b/src/calibre/gui2/tweak_book/preferences.py
@@ -10,7 +10,6 @@ from operator import attrgetter, methodcaller
 from collections import namedtuple
 from future_builtins import map
 from itertools import product
-from functools import partial
 from copy import copy, deepcopy
 
 from PyQt5.Qt import (
@@ -185,7 +184,7 @@ class EditorSettings(BasicSettings):
 
         self.tb = b = QPushButton(_('Change &templates'))
         l.addRow(_('Templates for new files:'), b)
-        b.clicked.connect(lambda : TemplatesDialog(self).exec_())
+        connect_lambda(b.clicked, self, lambda self: TemplatesDialog(self).exec_())
 
         lw = self('editor_line_wrap')
         lw.setText(_('&Wrap long lines in the editor'))
@@ -415,10 +414,10 @@ class ToolbarSettings(QWidget):
         l.addWidget(gb1, 0, 0, -1, 1), l.addWidget(gb2, 0, 2, -1, 1)
         self.available, self.current = ToolbarList(self), ToolbarList(self)
         self.ub = b = QToolButton(self)
-        b.clicked.connect(partial(self.move, up=True))
+        connect_lambda(b.clicked, self, lambda self: self.move(up=True))
         b.setToolTip(_('Move selected action up')), b.setIcon(QIcon(I('arrow-up.png')))
         self.db = b = QToolButton(self)
-        b.clicked.connect(partial(self.move, up=False))
+        connect_lambda(b.clicked, self, lambda self: self.move(up=False))
         b.setToolTip(_('Move selected action down')), b.setIcon(QIcon(I('arrow-down.png')))
         self.gl1 = gl1 = QVBoxLayout()
         gl1.addWidget(self.available), gb1.setLayout(gl1)
diff --git a/src/calibre/gui2/tweak_book/preview.py b/src/calibre/gui2/tweak_book/preview.py
index 18ed430b46..073c6d30bc 100644
--- a/src/calibre/gui2/tweak_book/preview.py
+++ b/src/calibre/gui2/tweak_book/preview.py
@@ -474,12 +474,12 @@ class Preview(QWidget):
         self.search = HistoryLineEdit2(self)
         self.search.initialize('tweak_book_preview_search')
         self.search.setPlaceholderText(_('Search in preview'))
-        self.search.returnPressed.connect(partial(self.find, 'next'))
+        connect_lambda(self.search.returnPressed, self, lambda self: self.find('next'))
         self.bar.addSeparator()
         self.bar.addWidget(self.search)
         for d in ('next', 'prev'):
             ac = actions['find-%s-preview' % d]
-            ac.triggered.connect(partial(self.find, d))
+            ac.triggered.connect(getattr(self, 'find_' + d))
             self.bar.addAction(ac)
 
     def find(self, direction):
@@ -487,6 +487,12 @@ class Preview(QWidget):
         self.view.findText(text, QWebPage.FindWrapsAroundDocument | (
             QWebPage.FindBackward if direction == 'prev' else QWebPage.FindFlags(0)))
 
+    def find_next(self):
+        self.find('next')
+
+    def find_prev(self):
+        self.find('prev')
+
     def request_sync(self, tagname, href, lnum):
         if self.current_name:
             c = current_container()
diff --git a/src/calibre/gui2/tweak_book/spell.py b/src/calibre/gui2/tweak_book/spell.py
index 8629aca4f2..5fee7aaa1e 100644
--- a/src/calibre/gui2/tweak_book/spell.py
+++ b/src/calibre/gui2/tweak_book/spell.py
@@ -934,7 +934,7 @@ class SpellCheck(Dialog):
         b = self.bb.addButton(_('&Refresh'), self.bb.ActionRole)
         b.setToolTip('<p>' + _('Re-scan the book for words, useful if you have edited the book since opening this dialog'))
         b.setIcon(QIcon(I('view-refresh.png')))
-        b.clicked.connect(partial(self.refresh, change_request=None))
+        connect_lambda(b.clicked, self, lambda self: self.refresh(change_request=None))
         b = self.bb.addButton(_('&Undo last change'), self.bb.ActionRole)
         b.setToolTip('<p>' + _('Undo the last spell check word replacement, if any'))
         b.setIcon(QIcon(I('edit-undo.png')))
diff --git a/src/calibre/gui2/tweak_book/text_search.py b/src/calibre/gui2/tweak_book/text_search.py
index d00ecc530c..33f453aabe 100644
--- a/src/calibre/gui2/tweak_book/text_search.py
+++ b/src/calibre/gui2/tweak_book/text_search.py
@@ -4,7 +4,6 @@
 
 from __future__ import (unicode_literals, division, absolute_import,
                         print_function)
-from functools import partial
 
 from PyQt5.Qt import (
     QWidget, QHBoxLayout, QVBoxLayout, QLabel, QComboBox, QPushButton, QIcon,
@@ -127,10 +126,12 @@ class TextSearch(QWidget):
         h.addStretch(10)
         self.next_button = b = QPushButton(QIcon(I('arrow-down.png')), _('&Next'), self)
         b.setToolTip(_('Find next match'))
-        h.addWidget(b), b.clicked.connect(partial(self.do_search, 'down'))
+        h.addWidget(b)
+        connect_lambda(b.clicked, self, lambda self: self.do_search('down'))
         self.prev_button = b = QPushButton(QIcon(I('arrow-up.png')), _('&Previous'), self)
         b.setToolTip(_('Find previous match'))
-        h.addWidget(b), b.clicked.connect(partial(self.do_search, 'up'))
+        h.addWidget(b)
+        connect_lambda(b.clicked, self, lambda self: self.do_search('up'))
 
         state = tprefs.get('text_search_widget_state')
         self.state = state or {}
diff --git a/src/calibre/gui2/tweak_book/widgets.py b/src/calibre/gui2/tweak_book/widgets.py
index 8a92c8badf..20180deaca 100644
--- a/src/calibre/gui2/tweak_book/widgets.py
+++ b/src/calibre/gui2/tweak_book/widgets.py
@@ -570,7 +570,7 @@ class NamesModel(QAbstractListModel):
 def create_filterable_names_list(names, filter_text=None, parent=None, model=NamesModel):
     nl = QListView(parent)
     nl.m = m = model(names, parent=nl)
-    m.filtered.connect(lambda all_items: nl.scrollTo(m.index(0)))
+    connect_lambda(m.filtered, nl, lambda nl, all_items: nl.scrollTo(m.index(0)))
     nl.setModel(m)
     if model is NamesModel:
         nl.d = NamesDelegate(nl)