Remove selection container set_title and get_title

Author: jasongrout

docs/source/examples/Widget List.ipynb

@@ -1223,9 +1223,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "accordion = widgets.Accordion(children=[widgets.IntSlider(), widgets.Text()])\n",
-    "accordion.set_title(0, 'Slider')\n",
-    "accordion.set_title(1, 'Text')\n",
+    "accordion = widgets.Accordion(children=[widgets.IntSlider(), widgets.Text()], titles=('Slider', 'Text'))\n",
     "accordion"
    ]
   },
@@ -1248,8 +1246,7 @@
     "children = [widgets.Text(description=name) for name in tab_contents]\n",
     "tab = widgets.Tab()\n",
     "tab.children = children\n",
-    "for i in range(len(children)):\n",
-    "    tab.set_title(i, str(i))\n",
+    "tab.titles = [str(i) for i in range(len(children))]\n",
     "tab"
    ]
   },
@@ -1347,8 +1344,7 @@
    "source": [
     "tab_nest = widgets.Tab()\n",
     "tab_nest.children = [accordion, accordion]\n",
-    "tab_nest.set_title(0, 'An accordion')\n",
-    "tab_nest.set_title(1, 'Copy of the accordion')\n",
+    "tab_nest.titles = ('An accordion', 'Copy of the accordion')\n",
     "tab_nest"
    ]
   },

ipywidgets/widgets/widget_selectioncontainer.py

@@ -29,34 +29,6 @@ def _validated_index(self, proposal):
         else:
             raise TraitError('Invalid selection: index out of bounds')
 
-    # Public methods
-    def set_title(self, index, title):
-        """Sets the title of a container page.
-
-        Parameters
-        ----------
-        index : int
-            Index of the container page
-        title : unicode
-            New title
-        """
-        titles = list(self.titles)
-        titles[index] = title
-        self.titles = titles
-
-    def get_title(self, index):
-        """Gets the title of a container page.
-
-        Parameters
-        ----------
-        index : int
-            Index of the container page
-        """
-        if 0<=index<len(self.titles):
-            return self.titles[index]
-        else:
-            return None
-
 @register
 class Accordion(_SelectionContainer):
     """Displays children each on a separate accordion page."""