diff --git a/Lib/idlelib/idle_test/mock_tk.py b/Lib/idlelib/idle_test/mock_tk.py
index 279f4be..d2ab038 100644
--- a/Lib/idlelib/idle_test/mock_tk.py
+++ b/Lib/idlelib/idle_test/mock_tk.py
@@ -114,7 +114,7 @@
         try:
             index=index.lower()
         except AttributeError:
-            raise TclError('bad text index "%s"' % index) from None
+            raise TclError('bad text index "%s"' % index)
 
         lastline =  len(self.data) - 1  # same as number of text lines
         if index == 'insert':
diff --git a/Lib/idlelib/idle_test/test_text.py b/Lib/idlelib/idle_test/test_text.py
index 367bf38..3a0705b 100644
--- a/Lib/idlelib/idle_test/test_text.py
+++ b/Lib/idlelib/idle_test/test_text.py
@@ -1,9 +1,9 @@
 # Test mock_tk.Text class against tkinter.Text class by running same tests with both.
 import unittest
-from test.support import requires
+from test.test_support import requires
 
 from _tkinter import TclError
-import tkinter as tk
+import Tkinter as tk
 
 class TextTest(object):
 
@@ -214,7 +214,7 @@
     @classmethod
     def setUpClass(cls):
         requires('gui')
-        from tkinter import Tk, Text
+        from Tkinter import Tk, Text
         cls.Text = Text
         cls.root = Tk()