diff -r 9928a927975f Lib/tkinter/__init__.py
--- a/Lib/tkinter/__init__.py	Sat Nov 02 13:21:28 2013 -0500
+++ b/Lib/tkinter/__init__.py	Sat Nov 02 21:48:24 2013 +0200
@@ -3472,7 +3472,7 @@
         bounding box may refer to a region outside the
         visible area of the window.
         """
-        return self.tk.call(self._w, 'bbox', index)
+        return self._getints(self.tk.call(self._w, 'bbox', index))
 
     def delete(self, first, last=None):
         """Delete one or more elements of the spinbox.
@@ -3481,9 +3481,9 @@
         and last is the index of the character just after
         the last one to delete. If last isn't specified it
         defaults to first+1, i.e. a single character is
-        deleted.  This command returns an empty string.
+        deleted.
         """
-        return self.tk.call(self._w, 'delete', first, last)
+        self.tk.call(self._w, 'delete', first, last)
 
     def get(self):
         """Returns the spinbox's string"""
@@ -3493,9 +3493,9 @@
         """Alter the position of the insertion cursor.
 
         The insertion cursor will be displayed just before
-        the character given by index. Returns an empty string
+        the character given by index.
         """
-        return self.tk.call(self._w, 'icursor', index)
+        self.tk.call(self._w, 'icursor', index)
 
     def identify(self, x, y):
         """Returns the name of the widget at position x, y
@@ -3505,16 +3505,12 @@
         return self.tk.call(self._w, 'identify', x, y)
 
     def index(self, index):
-        """Returns the numerical index corresponding to index
-        """
+        """Returns the numerical index corresponding to index."""
         return self.tk.call(self._w, 'index', index)
 
     def insert(self, index, s):
-        """Insert string s at index
-
-         Returns an empty string.
-        """
-        return self.tk.call(self._w, 'insert', index, s)
+        """Insert string s at index."""
+        self.tk.call(self._w, 'insert', index, s)
 
     def invoke(self, element):
         """Causes the specified element to be invoked
@@ -3522,7 +3518,7 @@
         The element could be buttondown or buttonup
         triggering the action associated with it.
         """
-        return self.tk.call(self._w, 'invoke', element)
+        self.tk.call(self._w, 'invoke', element)
 
     def scan(self, *args):
         """Internal function."""
diff -r 9928a927975f Lib/tkinter/test/test_tkinter/test_widgets.py
--- a/Lib/tkinter/test/test_tkinter/test_widgets.py	Sat Nov 02 13:21:28 2013 -0500
+++ b/Lib/tkinter/test/test_tkinter/test_widgets.py	Sat Nov 02 21:48:24 2013 +0200
@@ -457,6 +457,18 @@
         widget = self.create()
         self.checkBooleanParam(widget, 'wrap')
 
+    def test_bbox(self):
+        widget = self.create()
+        bbox = widget.bbox(0)
+        self.assertEqual(len(bbox), 4)
+        for item in bbox:
+            self.assertIsInstance(item, int)
+
+        self.assertRaises(tkinter.TclError, widget.bbox, 'noindex')
+        self.assertRaises(tkinter.TclError, widget.bbox, None)
+        self.assertRaises(TypeError, widget.bbox)
+        self.assertRaises(TypeError, widget.bbox, 0, 1)
+
 
 @add_standard_options(StandardOptionsTests)
 class TextTest(AbstractWidgetTest, unittest.TestCase):
diff -r 9928a927975f Misc/NEWS
--- a/Misc/NEWS	Sat Nov 02 13:21:28 2013 -0500
+++ b/Misc/NEWS	Sat Nov 02 21:48:24 2013 +0200
@@ -31,6 +31,10 @@
 Library
 -------
 
+- Issue #6160: The bbox() method of tkinter.Spinbox now returns a tuple of
+  integers instead of a string.  The delete(), icursor(), insert(), and invoke()
+  methods now returns None instead of an empty string.
+
 - Issue #19286: Directories in ``package_data`` are no longer added to
   the filelist, preventing failure outlined in the ticket.