From 8882cc20755c869c11ab1257bb0a5831fe1332dd Mon Sep 17 00:00:00 2001
From: Terry Jan Reedy <tjreedy@udel.edu>
Date: Sun, 3 Dec 2023 23:21:35 -0500
Subject: [PATCH 1/2] gh-66819: More IDLE htest updates(3)

Revise spec-callable pairs from percolator to end.
---
 Lib/idlelib/help.py            |  4 ++--
 Lib/idlelib/idle_test/htest.py | 16 ++++++++--------
 Lib/idlelib/percolator.py      | 12 ++++++------
 Lib/idlelib/scrolledlist.py    |  3 ++-
 Lib/idlelib/stackviewer.py     |  4 ++--
 Lib/idlelib/undo.py            | 14 +++++++-------
 6 files changed, 27 insertions(+), 26 deletions(-)

diff --git a/Lib/idlelib/help.py b/Lib/idlelib/help.py
index cc027b9cef4f5b3..580a327f620a792 100644
--- a/Lib/idlelib/help.py
+++ b/Lib/idlelib/help.py
@@ -278,7 +278,7 @@ def copy_strip():
             out.write(line.rstrip() + b'\n')
     print(f'{src} copied to {dst}')
 
-def show_idlehelp(parent):
+def _helpwindow(parent):
     "Create HelpWindow; called from Idle Help event handler."
     filename = join(abspath(dirname(__file__)), 'help.html')
     if not isfile(filename):
@@ -291,4 +291,4 @@ def show_idlehelp(parent):
     main('idlelib.idle_test.test_help', verbosity=2, exit=False)
 
     from idlelib.idle_test.htest import run
-    run(show_idlehelp)
+    run(_helpwindow)
diff --git a/Lib/idlelib/idle_test/htest.py b/Lib/idlelib/idle_test/htest.py
index a59b474fba47d8f..4042106bf44a9f7 100644
--- a/Lib/idlelib/idle_test/htest.py
+++ b/Lib/idlelib/idle_test/htest.py
@@ -190,6 +190,13 @@
            "<Escape>, [Cancel], or [X] prints None to shell"
     }
 
+_helpwindow_spec = {
+    'file': 'help',
+    'kwds': {},
+    'msg': "If the help text displays, this works.\n"
+           "Text is selectable. Window is scrollable."
+    }
+
 _io_binding_spec = {
     'file': 'iomenu',
     'kwds': {},
@@ -312,14 +319,7 @@
            "Right clicking an item will display a popup."
     }
 
-show_idlehelp_spec = {
-    'file': 'help',
-    'kwds': {},
-    'msg': "If the help text displays, this works.\n"
-           "Text is selectable. Window is scrollable."
-    }
-
-_stack_viewer_spec = {
+_stackbrowser_spec = {
     'file': 'stackviewer',
     'kwds': {},
     'msg': "A stacktrace for a NameError exception.\n"
diff --git a/Lib/idlelib/percolator.py b/Lib/idlelib/percolator.py
index 1fe34d29f54eb28..91ad7272f4ae560 100644
--- a/Lib/idlelib/percolator.py
+++ b/Lib/idlelib/percolator.py
@@ -86,11 +86,11 @@ def delete(self, *args):
             print(self.name, ": delete", args)
             self.delegate.delete(*args)
 
-    box = tk.Toplevel(parent)
-    box.title("Test Percolator")
+    top = tk.Toplevel(parent)
+    top.title("Test Percolator")
     x, y = map(int, parent.geometry().split('+')[1:])
-    box.geometry("+%d+%d" % (x, y + 175))
-    text = tk.Text(box)
+    top.geometry("+%d+%d" % (x, y + 175))
+    text = tk.Text(top)
     p = Percolator(text)
     pin = p.insertfilter
     pout = p.removefilter
@@ -104,10 +104,10 @@ def toggle2():
 
     text.pack()
     var1 = tk.IntVar(parent)
-    cb1 = tk.Checkbutton(box, text="Tracer1", command=toggle1, variable=var1)
+    cb1 = tk.Checkbutton(top, text="Tracer1", command=toggle1, variable=var1)
     cb1.pack()
     var2 = tk.IntVar(parent)
-    cb2 = tk.Checkbutton(box, text="Tracer2", command=toggle2, variable=var2)
+    cb2 = tk.Checkbutton(top, text="Tracer2", command=toggle2, variable=var2)
     cb2.pack()
 
 if __name__ == "__main__":
diff --git a/Lib/idlelib/scrolledlist.py b/Lib/idlelib/scrolledlist.py
index 71fd18ab19ec8ae..4f1241a576fca1c 100644
--- a/Lib/idlelib/scrolledlist.py
+++ b/Lib/idlelib/scrolledlist.py
@@ -132,6 +132,7 @@ def _scrolled_list(parent):  # htest #
     top = Toplevel(parent)
     x, y = map(int, parent.geometry().split('+')[1:])
     top.geometry("+%d+%d" % (x+200, y + 175))
+
     class MyScrolledList(ScrolledList):
         def fill_menu(self): self.menu.add_command(label="right click")
         def on_select(self, index): print("select", self.get(index))
@@ -143,7 +144,7 @@ def on_double(self, index): print("double", self.get(index))
 
 if __name__ == '__main__':
     from unittest import main
-    main('idlelib.idle_test.test_scrolledlist', verbosity=2,)
+    main('idlelib.idle_test.test_scrolledlist', verbosity=2, exit=False)
 
     from idlelib.idle_test.htest import run
     run(_scrolled_list)
diff --git a/Lib/idlelib/stackviewer.py b/Lib/idlelib/stackviewer.py
index f8e60fd9b6d818a..977c56ef15f2ae4 100644
--- a/Lib/idlelib/stackviewer.py
+++ b/Lib/idlelib/stackviewer.py
@@ -113,7 +113,7 @@ def setfunction(value, key=key, object=self.object):
         return sublist
 
 
-def _stack_viewer(parent):  # htest #
+def _stackbrowser(parent):  # htest #
     from idlelib.pyshell import PyShellFileList
     top = tk.Toplevel(parent)
     top.title("Test StackViewer")
@@ -131,4 +131,4 @@ def _stack_viewer(parent):  # htest #
     main('idlelib.idle_test.test_stackviewer', verbosity=2, exit=False)
 
     from idlelib.idle_test.htest import run
-    run(_stack_viewer)
+    run(_stackbrowser)
diff --git a/Lib/idlelib/undo.py b/Lib/idlelib/undo.py
index 5f10c0f05c1acbf..f1d03f4c9ed5ef9 100644
--- a/Lib/idlelib/undo.py
+++ b/Lib/idlelib/undo.py
@@ -339,23 +339,23 @@ def bump_depth(self, incr=1):
 def _undo_delegator(parent):  # htest #
     from tkinter import Toplevel, Text, Button
     from idlelib.percolator import Percolator
-    undowin = Toplevel(parent)
-    undowin.title("Test UndoDelegator")
+    top = Toplevel(parent)
+    top.title("Test UndoDelegator")
     x, y = map(int, parent.geometry().split('+')[1:])
-    undowin.geometry("+%d+%d" % (x, y + 175))
+    top.geometry("+%d+%d" % (x, y + 175))
 
-    text = Text(undowin, height=10)
+    text = Text(top, height=10)
     text.pack()
     text.focus_set()
     p = Percolator(text)
     d = UndoDelegator()
     p.insertfilter(d)
 
-    undo = Button(undowin, text="Undo", command=lambda:d.undo_event(None))
+    undo = Button(top, text="Undo", command=lambda:d.undo_event(None))
     undo.pack(side='left')
-    redo = Button(undowin, text="Redo", command=lambda:d.redo_event(None))
+    redo = Button(top, text="Redo", command=lambda:d.redo_event(None))
     redo.pack(side='left')
-    dump = Button(undowin, text="Dump", command=lambda:d.dump_event(None))
+    dump = Button(top, text="Dump", command=lambda:d.dump_event(None))
     dump.pack(side='left')
 
 if __name__ == "__main__":

From 178e9bf386378b45a7b0f245b39cbe96693f838f Mon Sep 17 00:00:00 2001
From: Terry Jan Reedy <tjreedy@udel.edu>
Date: Mon, 4 Dec 2023 00:58:44 -0500
Subject: [PATCH 2/2] gh-66819: More IDLE htest updates(4)

Mostly double spacing before 'if __name__...'.
---
 Lib/idlelib/browser.py         |  1 +
 Lib/idlelib/calltip_w.py       |  1 +
 Lib/idlelib/config.py          |  1 +
 Lib/idlelib/debugobj.py        |  1 +
 Lib/idlelib/delegator.py       |  1 +
 Lib/idlelib/dynoption.py       |  2 ++
 Lib/idlelib/editor.py          |  1 +
 Lib/idlelib/filelist.py        |  1 +
 Lib/idlelib/grep.py            |  6 ++--
 Lib/idlelib/help.py            |  2 ++
 Lib/idlelib/idle_test/htest.py | 59 +++++++++++++++++-----------------
 Lib/idlelib/iomenu.py          |  2 ++
 Lib/idlelib/multicall.py       |  1 +
 Lib/idlelib/outwin.py          |  1 +
 Lib/idlelib/percolator.py      |  2 ++
 Lib/idlelib/pyshell.py         |  1 +
 Lib/idlelib/redirector.py      |  1 +
 Lib/idlelib/replace.py         |  1 +
 Lib/idlelib/scrolledlist.py    |  1 +
 Lib/idlelib/search.py          |  1 +
 Lib/idlelib/sidebar.py         |  4 +--
 Lib/idlelib/statusbar.py       |  1 +
 Lib/idlelib/tree.py            |  1 +
 Lib/idlelib/undo.py            |  1 +
 Lib/idlelib/util.py            |  1 +
 25 files changed, 61 insertions(+), 34 deletions(-)

diff --git a/Lib/idlelib/browser.py b/Lib/idlelib/browser.py
index 672e229ffbca94a..8b9060e57072ea0 100644
--- a/Lib/idlelib/browser.py
+++ b/Lib/idlelib/browser.py
@@ -250,6 +250,7 @@ def closure():
             class Nested_in_closure: pass
     ModuleBrowser(parent, file, _htest=True)
 
+
 if __name__ == "__main__":
     if len(sys.argv) == 1:  # If pass file on command line, unittest fails.
         from unittest import main
diff --git a/Lib/idlelib/calltip_w.py b/Lib/idlelib/calltip_w.py
index 278546064adde29..9386376058c7916 100644
--- a/Lib/idlelib/calltip_w.py
+++ b/Lib/idlelib/calltip_w.py
@@ -193,6 +193,7 @@ def calltip_hide(event):
 
     text.focus_set()
 
+
 if __name__ == '__main__':
     from unittest import main
     main('idlelib.idle_test.test_calltip_w', verbosity=2, exit=False)
diff --git a/Lib/idlelib/config.py b/Lib/idlelib/config.py
index 898efeb4dd15508..92992fd9cce9cd6 100644
--- a/Lib/idlelib/config.py
+++ b/Lib/idlelib/config.py
@@ -906,6 +906,7 @@ def dumpCfg(cfg):
     dumpCfg(idleConf.userCfg)
     print('\nlines = ', line, ', crc = ', crc, sep='')
 
+
 if __name__ == '__main__':
     from unittest import main
     main('idlelib.idle_test.test_config', verbosity=2, exit=False)
diff --git a/Lib/idlelib/debugobj.py b/Lib/idlelib/debugobj.py
index 0bf2cb1d5bbfe26..156377f8ed26ac2 100644
--- a/Lib/idlelib/debugobj.py
+++ b/Lib/idlelib/debugobj.py
@@ -135,6 +135,7 @@ def _debug_object_browser(parent):  # htest #
     node = TreeNode(sc.canvas, None, item)
     node.update()
 
+
 if __name__ == '__main__':
     from unittest import main
     main('idlelib.idle_test.test_debugobj', verbosity=2, exit=False)
diff --git a/Lib/idlelib/delegator.py b/Lib/idlelib/delegator.py
index 55c95da8532f472..93ae8bbd43ff440 100644
--- a/Lib/idlelib/delegator.py
+++ b/Lib/idlelib/delegator.py
@@ -28,6 +28,7 @@ def setdelegate(self, delegate):
         self.resetcache()
         self.delegate = delegate
 
+
 if __name__ == '__main__':
     from unittest import main
     main('idlelib.idle_test.test_delegator', verbosity=2)
diff --git a/Lib/idlelib/dynoption.py b/Lib/idlelib/dynoption.py
index d5dfc3eda13f60a..b8937f7106ca75b 100644
--- a/Lib/idlelib/dynoption.py
+++ b/Lib/idlelib/dynoption.py
@@ -29,6 +29,7 @@ def SetMenu(self,valueList,value=None):
         if value:
             self.variable.set(value)
 
+
 def _dyn_option_menu(parent):  # htest #
     from tkinter import Toplevel # + StringVar, Button
 
@@ -49,6 +50,7 @@ def update():
     button = Button(top, text="Change option set", command=update)
     button.pack()
 
+
 if __name__ == '__main__':
     # Only module without unittests because of intention to replace.
     from idlelib.idle_test.htest import run
diff --git a/Lib/idlelib/editor.py b/Lib/idlelib/editor.py
index 69b27d0683a1045..6ad383f460c7ee2 100644
--- a/Lib/idlelib/editor.py
+++ b/Lib/idlelib/editor.py
@@ -1748,6 +1748,7 @@ def _editor_window(parent):  # htest #
     # Does not stop error, neither does following
     # edit.text.bind("<<close-window>>", edit.close_event)
 
+
 if __name__ == '__main__':
     from unittest import main
     main('idlelib.idle_test.test_editor', verbosity=2, exit=False)
diff --git a/Lib/idlelib/filelist.py b/Lib/idlelib/filelist.py
index f87781d2570fe06..e27e5d32a0ff633 100644
--- a/Lib/idlelib/filelist.py
+++ b/Lib/idlelib/filelist.py
@@ -124,6 +124,7 @@ def _test():  # TODO check and convert to htest
     if flist.inversedict:
         root.mainloop()
 
+
 if __name__ == '__main__':
     from unittest import main
     main('idlelib.idle_test.test_filelist', verbosity=2)
diff --git a/Lib/idlelib/grep.py b/Lib/idlelib/grep.py
index 12513594b76f8fd..ef14349960bfa2c 100644
--- a/Lib/idlelib/grep.py
+++ b/Lib/idlelib/grep.py
@@ -204,15 +204,17 @@ def _grep_dialog(parent):  # htest #
     frame.pack()
     text = Text(frame, height=5)
     text.pack()
+    text.insert('1.0', 'import grep')
 
     def show_grep_dialog():
-        text.tag_add(SEL, "1.0", END)
+        text.tag_add(SEL, "1.0", '1.end')
         grep(text, flist=flist)
-        text.tag_remove(SEL, "1.0", END)
+        text.tag_remove(SEL, "1.0", '1.end')
 
     button = Button(frame, text="Show GrepDialog", command=show_grep_dialog)
     button.pack()
 
+
 if __name__ == "__main__":
     from unittest import main
     main('idlelib.idle_test.test_grep', verbosity=2, exit=False)
diff --git a/Lib/idlelib/help.py b/Lib/idlelib/help.py
index 580a327f620a792..3cc7e36e35555b0 100644
--- a/Lib/idlelib/help.py
+++ b/Lib/idlelib/help.py
@@ -278,6 +278,7 @@ def copy_strip():
             out.write(line.rstrip() + b'\n')
     print(f'{src} copied to {dst}')
 
+
 def _helpwindow(parent):
     "Create HelpWindow; called from Idle Help event handler."
     filename = join(abspath(dirname(__file__)), 'help.html')
@@ -286,6 +287,7 @@ def _helpwindow(parent):
         return
     HelpWindow(parent, filename, 'IDLE Help (%s)' % python_version())
 
+
 if __name__ == '__main__':
     from unittest import main
     main('idlelib.idle_test.test_help', verbosity=2, exit=False)
diff --git a/Lib/idlelib/idle_test/htest.py b/Lib/idlelib/idle_test/htest.py
index 4042106bf44a9f7..88cfa5eea247c94 100644
--- a/Lib/idlelib/idle_test/htest.py
+++ b/Lib/idlelib/idle_test/htest.py
@@ -170,8 +170,8 @@
     'msg': "Click the 'Show GrepDialog' button.\n"
            "Test the various 'Find-in-files' functions.\n"
            "The results should be displayed in a new '*Output*' window.\n"
-           "'Right-click'->'Go to file/line' anywhere in the search results "
-           "should open that file \nin a new EditorWindow."
+           "'Right-click'->'Go to file/line' in the search results\n "
+           "should open that file in a new EditorWindow."
     }
 
 HelpSource_spec = {
@@ -210,26 +210,6 @@
            "Check that changes were saved by opening the file elsewhere."
     }
 
-_linenumbers_drag_scrolling_spec = {
-    'file': 'sidebar',
-    'kwds': {},
-    'msg': textwrap.dedent("""\
-        1. Click on the line numbers and drag down below the edge of the
-        window, moving the mouse a bit and then leaving it there for a
-        while. The text and line numbers should gradually scroll down,
-        with the selection updated continuously.
-
-        2. With the lines still selected, click on a line number above
-        or below the selected lines. Only the line whose number was
-        clicked should be selected.
-
-        3. Repeat step #1, dragging to above the window. The text and
-        line numbers should gradually scroll up, with the selection
-        updated continuously.
-
-        4. Repeat step #2, clicking a line number below the selection."""),
-    }
-
 _multi_call_spec = {
     'file': 'multicall',
     'kwds': {},
@@ -295,6 +275,15 @@
            "Click [Close] or [X] to close the 'Replace Dialog'."
     }
 
+_scrolled_list_spec = {
+    'file': 'scrolledlist',
+    'kwds': {},
+    'msg': "You should see a scrollable list of items\n"
+           "Selecting (clicking) or double clicking an item "
+           "prints the name to the console or Idle shell.\n"
+           "Right clicking an item will display a popup."
+    }
+
 _search_dialog_spec = {
     'file': 'search',
     'kwds': {},
@@ -310,21 +299,31 @@
            "Its only action is to close."
     }
 
-_scrolled_list_spec = {
-    'file': 'scrolledlist',
+_sidebar_number_scrolling_spec = {
+    'file': 'sidebar',
     'kwds': {},
-    'msg': "You should see a scrollable list of items\n"
-           "Selecting (clicking) or double clicking an item "
-           "prints the name to the console or Idle shell.\n"
-           "Right clicking an item will display a popup."
+    'msg': textwrap.dedent("""\
+        1. Click on the line numbers and drag down below the edge of the
+        window, moving the mouse a bit and then leaving it there for a
+        while. The text and line numbers should gradually scroll down,
+        with the selection updated continuously.
+
+        2. With the lines still selected, click on a line number above
+        or below the selected lines. Only the line whose number was
+        clicked should be selected.
+
+        3. Repeat step #1, dragging to above the window. The text and
+        line numbers should gradually scroll up, with the selection
+        updated continuously.
+
+        4. Repeat step #2, clicking a line number below the selection."""),
     }
 
 _stackbrowser_spec = {
     'file': 'stackviewer',
     'kwds': {},
     'msg': "A stacktrace for a NameError exception.\n"
-           "Expand 'idlelib ...' and '<locals>'.\n"
-           "Check that exc_value, exc_tb, and exc_type are correct.\n"
+           "Should have NameError and 1 traceback line."
     }
 
 _tooltip_spec = {
diff --git a/Lib/idlelib/iomenu.py b/Lib/idlelib/iomenu.py
index 7629101635b8bbe..667623ec71ac982 100644
--- a/Lib/idlelib/iomenu.py
+++ b/Lib/idlelib/iomenu.py
@@ -393,6 +393,7 @@ def updaterecentfileslist(self,filename):
         if self.editwin.flist:
             self.editwin.update_recent_files_list(filename)
 
+
 def _io_binding(parent):  # htest #
     from tkinter import Toplevel, Text
 
@@ -430,6 +431,7 @@ def savecopy(self, event):
     editwin = MyEditWin(text)
     IOBinding(editwin)
 
+
 if __name__ == "__main__":
     from unittest import main
     main('idlelib.idle_test.test_iomenu', verbosity=2, exit=False)
diff --git a/Lib/idlelib/multicall.py b/Lib/idlelib/multicall.py
index 2aa4a54125156f7..41f818131130621 100644
--- a/Lib/idlelib/multicall.py
+++ b/Lib/idlelib/multicall.py
@@ -442,6 +442,7 @@ def handler(event):
     bindseq("<Enter>")
     bindseq("<Leave>")
 
+
 if __name__ == "__main__":
     from unittest import main
     main('idlelib.idle_test.test_mainmenu', verbosity=2, exit=False)
diff --git a/Lib/idlelib/outwin.py b/Lib/idlelib/outwin.py
index 610031e26f1dffe..5ed3f35a7af6558 100644
--- a/Lib/idlelib/outwin.py
+++ b/Lib/idlelib/outwin.py
@@ -182,6 +182,7 @@ def setup(self):
         text.tag_raise('sel')
         self.write = self.owin.write
 
+
 if __name__ == '__main__':
     from unittest import main
     main('idlelib.idle_test.test_outwin', verbosity=2, exit=False)
diff --git a/Lib/idlelib/percolator.py b/Lib/idlelib/percolator.py
index 91ad7272f4ae560..aa73427c4915c8c 100644
--- a/Lib/idlelib/percolator.py
+++ b/Lib/idlelib/percolator.py
@@ -103,6 +103,7 @@ def toggle2():
         (pin if var2.get() else pout)(t2)
 
     text.pack()
+    text.focus_set()
     var1 = tk.IntVar(parent)
     cb1 = tk.Checkbutton(top, text="Tracer1", command=toggle1, variable=var1)
     cb1.pack()
@@ -110,6 +111,7 @@ def toggle2():
     cb2 = tk.Checkbutton(top, text="Tracer2", command=toggle2, variable=var2)
     cb2.pack()
 
+
 if __name__ == "__main__":
     from unittest import main
     main('idlelib.idle_test.test_percolator', verbosity=2, exit=False)
diff --git a/Lib/idlelib/pyshell.py b/Lib/idlelib/pyshell.py
index 00b3732a7bc4eb4..1524fccd5d20f8e 100755
--- a/Lib/idlelib/pyshell.py
+++ b/Lib/idlelib/pyshell.py
@@ -1694,6 +1694,7 @@ def main():
     root.destroy()
     capture_warnings(False)
 
+
 if __name__ == "__main__":
     main()
 
diff --git a/Lib/idlelib/redirector.py b/Lib/idlelib/redirector.py
index 4928340e98df686..08728956abd9008 100644
--- a/Lib/idlelib/redirector.py
+++ b/Lib/idlelib/redirector.py
@@ -164,6 +164,7 @@ def my_insert(*args):
         original_insert(*args)
     original_insert = redir.register("insert", my_insert)
 
+
 if __name__ == "__main__":
     from unittest import main
     main('idlelib.idle_test.test_redirector', verbosity=2, exit=False)
diff --git a/Lib/idlelib/replace.py b/Lib/idlelib/replace.py
index ca83173877ad1d9..a29ca5914274915 100644
--- a/Lib/idlelib/replace.py
+++ b/Lib/idlelib/replace.py
@@ -299,6 +299,7 @@ def show_replace():
     button = Button(frame, text="Replace", command=show_replace)
     button.pack()
 
+
 if __name__ == '__main__':
     from unittest import main
     main('idlelib.idle_test.test_replace', verbosity=2, exit=False)
diff --git a/Lib/idlelib/scrolledlist.py b/Lib/idlelib/scrolledlist.py
index 4f1241a576fca1c..4fb418db3262556 100644
--- a/Lib/idlelib/scrolledlist.py
+++ b/Lib/idlelib/scrolledlist.py
@@ -142,6 +142,7 @@ def on_double(self, index): print("double", self.get(index))
     for i in range(30):
         scrolled_list.append("Item %02d" % i)
 
+
 if __name__ == '__main__':
     from unittest import main
     main('idlelib.idle_test.test_scrolledlist', verbosity=2, exit=False)
diff --git a/Lib/idlelib/search.py b/Lib/idlelib/search.py
index b35f3b59c3d2e8f..935a4832257fa4a 100644
--- a/Lib/idlelib/search.py
+++ b/Lib/idlelib/search.py
@@ -156,6 +156,7 @@ def show_find():
     button = Button(frame, text="Search (selection ignored)", command=show_find)
     button.pack()
 
+
 if __name__ == '__main__':
     from unittest import main
     main('idlelib.idle_test.test_search', verbosity=2, exit=False)
diff --git a/Lib/idlelib/sidebar.py b/Lib/idlelib/sidebar.py
index 8e7eae5037c90c7..ff77b568a786e0f 100644
--- a/Lib/idlelib/sidebar.py
+++ b/Lib/idlelib/sidebar.py
@@ -513,7 +513,7 @@ def update_colors(self):
         self.change_callback()
 
 
-def _linenumbers_drag_scrolling(parent):  # htest #
+def _sidebar_number_scrolling(parent):  # htest #
     from idlelib.idle_test.test_sidebar import Dummy_editwin
 
     top = tk.Toplevel(parent)
@@ -540,4 +540,4 @@ def _linenumbers_drag_scrolling(parent):  # htest #
     main('idlelib.idle_test.test_sidebar', verbosity=2, exit=False)
 
     from idlelib.idle_test.htest import run
-    run(_linenumbers_drag_scrolling)
+    run(_sidebar_number_scrolling)
diff --git a/Lib/idlelib/statusbar.py b/Lib/idlelib/statusbar.py
index 7048bd64b98753f..8445d4cc8dfdb9e 100644
--- a/Lib/idlelib/statusbar.py
+++ b/Lib/idlelib/statusbar.py
@@ -43,6 +43,7 @@ def change():
     button.pack(side='bottom')
     frame.pack()
 
+
 if __name__ == '__main__':
     from unittest import main
     main('idlelib.idle_test.test_statusbar', verbosity=2, exit=False)
diff --git a/Lib/idlelib/tree.py b/Lib/idlelib/tree.py
index 5f30f0f6092bfa5..9c2eb47b24aec94 100644
--- a/Lib/idlelib/tree.py
+++ b/Lib/idlelib/tree.py
@@ -492,6 +492,7 @@ def _tree_widget(parent):  # htest #
     node = TreeNode(sc.canvas, None, item)
     node.expand()
 
+
 if __name__ == '__main__':
     from unittest import main
     main('idlelib.idle_test.test_tree', verbosity=2, exit=False)
diff --git a/Lib/idlelib/undo.py b/Lib/idlelib/undo.py
index f1d03f4c9ed5ef9..f52446d5fcdcf84 100644
--- a/Lib/idlelib/undo.py
+++ b/Lib/idlelib/undo.py
@@ -358,6 +358,7 @@ def _undo_delegator(parent):  # htest #
     dump = Button(top, text="Dump", command=lambda:d.dump_event(None))
     dump.pack(side='left')
 
+
 if __name__ == "__main__":
     from unittest import main
     main('idlelib.idle_test.test_undo', verbosity=2, exit=False)
diff --git a/Lib/idlelib/util.py b/Lib/idlelib/util.py
index ede670a4db55360..5ac69a7b94cb56d 100644
--- a/Lib/idlelib/util.py
+++ b/Lib/idlelib/util.py
@@ -16,6 +16,7 @@
 # .pyw is for Windows; .pyi is for stub files.
 py_extensions = ('.py', '.pyw', '.pyi')  # Order needed for open/save dialogs.
 
+
 if __name__ == '__main__':
     from unittest import main
     main('idlelib.idle_test.test_util', verbosity=2)