bpo-29919: Remove unused imports found by pyflakes (#137)

Make also minor PEP8 coding style fixes on modified imports.

Lib/idlelib/idle_test/test_config.py

@@ -3,9 +3,7 @@
 Much is tested by opening config dialog live or in test_configdialog.
 Coverage: 27%
 '''
-from sys import modules
 from test.support import captured_stderr
-from tkinter import Tk
 import unittest
 from idlelib import config
 

Lib/idlelib/idle_test/test_config_key.py

@@ -6,7 +6,7 @@ from idlelib import config_key
 from test.support import requires
 requires('gui')
 import unittest
-from tkinter import Tk, Text
+from tkinter import Tk
 
 
 class GetKeysTest(unittest.TestCase):

Lib/idlelib/idle_test/test_editor.py

@@ -1,7 +1,5 @@
 import unittest
-from tkinter import Tk, Text
 from idlelib.editor import EditorWindow
-from test.support import requires
 
 class Editor_func_test(unittest.TestCase):
     def test_filename_to_unicode(self):

Lib/idlelib/idle_test/test_searchbase.py

@@ -5,7 +5,7 @@ testing skipping of suite when self.needwrapbutton is false.
 '''
 import unittest
 from test.support import requires
-from tkinter import Tk, Toplevel, Frame ##, BooleanVar, StringVar
+from tkinter import Tk, Frame  ##, BooleanVar, StringVar
 from idlelib import searchengine as se
 from idlelib import searchbase as sdb
 from idlelib.idle_test.mock_idle import Func