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diff --git a/Lib/idlelib/macosx.py b/Lib/idlelib/macosx.py
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+++ b/Lib/idlelib/macosx.py
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+"""
+A number of functions that enhance IDLE on Mac OSX.
+"""
+from sys import platform  # Used in _init_tk_type, changed by test.
+import tkinter
+import warnings
+
+
+## Define functions that query the Mac graphics type.
+## _tk_type and its initializer are private to this section.
+
+_tk_type = None
+
+def _init_tk_type():
+    """
+    Initializes OS X Tk variant values for
+    isAquaTk(), isCarbonTk(), isCocoaTk(), and isXQuartz().
+    """
+    global _tk_type
+    if platform == 'darwin':
+        root = tkinter.Tk()
+        ws = root.tk.call('tk', 'windowingsystem')
+        if 'x11' in ws:
+            _tk_type = "xquartz"
+        elif 'aqua' not in ws:
+            _tk_type = "other"
+        elif 'AppKit' in root.tk.call('winfo', 'server', '.'):
+            _tk_type = "cocoa"
+        else:
+            _tk_type = "carbon"
+        root.destroy()
+    else:
+        _tk_type = "other"
+
+def isAquaTk():
+    """
+    Returns True if IDLE is using a native OS X Tk (Cocoa or Carbon).
+    """
+    if not _tk_type:
+        _init_tk_type()
+    return _tk_type == "cocoa" or _tk_type == "carbon"
+
+def isCarbonTk():
+    """
+    Returns True if IDLE is using a Carbon Aqua Tk (instead of the
+    newer Cocoa Aqua Tk).
+    """
+    if not _tk_type:
+        _init_tk_type()
+    return _tk_type == "carbon"
+
+def isCocoaTk():
+    """
+    Returns True if IDLE is using a Cocoa Aqua Tk.
+    """
+    if not _tk_type:
+        _init_tk_type()
+    return _tk_type == "cocoa"
+
+def isXQuartz():
+    """
+    Returns True if IDLE is using an OS X X11 Tk.
+    """
+    if not _tk_type:
+        _init_tk_type()
+    return _tk_type == "xquartz"
+
+
+def tkVersionWarning(root):
+    """
+    Returns a string warning message if the Tk version in use appears to
+    be one known to cause problems with IDLE.
+    1. Apple Cocoa-based Tk 8.5.7 shipped with Mac OS X 10.6 is unusable.
+    2. Apple Cocoa-based Tk 8.5.9 in OS X 10.7 and 10.8 is better but
+        can still crash unexpectedly.
+    """
+
+    if isCocoaTk():
+        patchlevel = root.tk.call('info', 'patchlevel')
+        if patchlevel not in ('8.5.7', '8.5.9'):
+            return False
+        return (r"WARNING: The version of Tcl/Tk ({0}) in use may"
+                r" be unstable.\n"
+                r"Visit http://www.python.org/download/mac/tcltk/"
+                r" for current information.".format(patchlevel))
+    else:
+        return False
+
+
+## Fix the menu and related functions.
+
+def addOpenEventSupport(root, flist):
+    """
+    This ensures that the application will respond to open AppleEvents, which
+    makes is feasible to use IDLE as the default application for python files.
+    """
+    def doOpenFile(*args):
+        for fn in args:
+            flist.open(fn)
+
+    # The command below is a hook in aquatk that is called whenever the app
+    # receives a file open event. The callback can have multiple arguments,
+    # one for every file that should be opened.
+    root.createcommand("::tk::mac::OpenDocument", doOpenFile)
+
+def hideTkConsole(root):
+    try:
+        root.tk.call('console', 'hide')
+    except tkinter.TclError:
+        # Some versions of the Tk framework don't have a console object
+        pass
+
+def overrideRootMenu(root, flist):
+    """
+    Replace the Tk root menu by something that is more appropriate for
+    IDLE with an Aqua Tk.
+    """
+    # The menu that is attached to the Tk root (".") is also used by AquaTk for
+    # all windows that don't specify a menu of their own. The default menubar
+    # contains a number of menus, none of which are appropriate for IDLE. The
+    # Most annoying of those is an 'About Tck/Tk...' menu in the application
+    # menu.
+    #
+    # This function replaces the default menubar by a mostly empty one, it
+    # should only contain the correct application menu and the window menu.
+    #
+    # Due to a (mis-)feature of TkAqua the user will also see an empty Help
+    # menu.
+    from tkinter import Menu
+    from idlelib import mainmenu
+    from idlelib import windows
+
+    closeItem = mainmenu.menudefs[0][1][-2]
+
+    # Remove the last 3 items of the file menu: a separator, close window and
+    # quit. Close window will be reinserted just above the save item, where
+    # it should be according to the HIG. Quit is in the application menu.
+    del mainmenu.menudefs[0][1][-3:]
+    mainmenu.menudefs[0][1].insert(6, closeItem)
+
+    # Remove the 'About' entry from the help menu, it is in the application
+    # menu
+    del mainmenu.menudefs[-1][1][0:2]
+    # Remove the 'Configure Idle' entry from the options menu, it is in the
+    # application menu as 'Preferences'
+    del mainmenu.menudefs[-2][1][0]
+    menubar = Menu(root)
+    root.configure(menu=menubar)
+    menudict = {}
+
+    menudict['windows'] = menu = Menu(menubar, name='windows', tearoff=0)
+    menubar.add_cascade(label='Window', menu=menu, underline=0)
+
+    def postwindowsmenu(menu=menu):
+        end = menu.index('end')
+        if end is None:
+            end = -1
+
+        if end > 0:
+            menu.delete(0, end)
+        windows.add_windows_to_menu(menu)
+    windows.register_callback(postwindowsmenu)
+
+    def about_dialog(event=None):
+        "Handle Help 'About IDLE' event."
+        # Synchronize with editor.EditorWindow.about_dialog.
+        from idlelib import help_about
+        help_about.AboutDialog(root, 'About IDLE')
+
+    def config_dialog(event=None):
+        "Handle Options 'Configure IDLE' event."
+        # Synchronize with editor.EditorWindow.config_dialog.
+        from idlelib import configdialog
+
+        # Ensure that the root object has an instance_dict attribute,
+        # mirrors code in EditorWindow (although that sets the attribute
+        # on an EditorWindow instance that is then passed as the first
+        # argument to ConfigDialog)
+        root.instance_dict = flist.inversedict
+        configdialog.ConfigDialog(root, 'Settings')
+
+    def help_dialog(event=None):
+        "Handle Help 'IDLE Help' event."
+        # Synchronize with editor.EditorWindow.help_dialog.
+        from idlelib import help
+        help.show_idlehelp(root)
+
+    root.bind('<<about-idle>>', about_dialog)
+    root.bind('<<open-config-dialog>>', config_dialog)
+    root.createcommand('::tk::mac::ShowPreferences', config_dialog)
+    if flist:
+        root.bind('<<close-all-windows>>', flist.close_all_callback)
+
+        # The binding above doesn't reliably work on all versions of Tk
+        # on MacOSX. Adding command definition below does seem to do the
+        # right thing for now.
+        root.createcommand('exit', flist.close_all_callback)
+
+    if isCarbonTk():
+        # for Carbon AquaTk, replace the default Tk apple menu
+        menudict['application'] = menu = Menu(menubar, name='apple',
+                                              tearoff=0)
+        menubar.add_cascade(label='IDLE', menu=menu)
+        mainmenu.menudefs.insert(0,
+            ('application', [
+                ('About IDLE', '<<about-idle>>'),
+                    None,
+                ]))
+    if isCocoaTk():
+        # replace default About dialog with About IDLE one
+        root.createcommand('tkAboutDialog', about_dialog)
+        # replace default "Help" item in Help menu
+        root.createcommand('::tk::mac::ShowHelp', help_dialog)
+        # remove redundant "IDLE Help" from menu
+        del mainmenu.menudefs[-1][1][0]
+
+def fixb2context(root):
+    '''Removed bad AquaTk Button-2 (right) and Paste bindings.
+
+    They prevent context menu access and seem to be gone in AquaTk8.6.
+    See issue #24801.
+    '''
+    root.unbind_class('Text', '<B2>')
+    root.unbind_class('Text', '<B2-Motion>')
+    root.unbind_class('Text', '<<PasteSelection>>')
+
+def setupApp(root, flist):
+    """
+    Perform initial OS X customizations if needed.
+    Called from pyshell.main() after initial calls to Tk()
+
+    There are currently three major versions of Tk in use on OS X:
+        1. Aqua Cocoa Tk (native default since OS X 10.6)
+        2. Aqua Carbon Tk (original native, 32-bit only, deprecated)
+        3. X11 (supported by some third-party distributors, deprecated)
+    There are various differences among the three that affect IDLE
+    behavior, primarily with menus, mouse key events, and accelerators.
+    Some one-time customizations are performed here.
+    Others are dynamically tested throughout idlelib by calls to the
+    isAquaTk(), isCarbonTk(), isCocoaTk(), isXQuartz() functions which
+    are initialized here as well.
+    """
+    if isAquaTk():
+        hideTkConsole(root)
+        overrideRootMenu(root, flist)
+        addOpenEventSupport(root, flist)
+        fixb2context(root)
+
+
+if __name__ == '__main__':
+    from unittest import main
+    main('idlelib.idle_test.test_macosx', verbosity=2)