Issue #25507: Merge from 3.5 with ttk replacing colorchooser.

IDLE no longer runs buggy code because of its tkinter imports.
Users must include the same imports required to run directly in Python.

Lib/idlelib/run.py

@@ -19,6 +19,12 @@ from idlelib import iomenu
 
 import __main__
 
+for mod in ('simpledialog', 'messagebox', 'font',
+            'dialog', 'filedialog', 'commondialog',
+            'ttk'):
+    delattr(tkinter, mod)
+    del sys.modules['tkinter.' + mod]
+
 LOCALHOST = '127.0.0.1'
 
 import warnings