diff --git a/IPython/core/interactiveshell.py b/IPython/core/interactiveshell.py
index e63785b..daa295b 100644
--- a/IPython/core/interactiveshell.py
+++ b/IPython/core/interactiveshell.py
@@ -243,8 +243,6 @@ class InteractiveShell(SingletonConfigurable):
         """
     )
     
-    banner = Unicode('')
-    
     banner1 = Unicode(default_banner, config=True,
         help="""The part of the banner to be printed before the profile"""
     )
diff --git a/IPython/html/static/notebook/js/actions.js b/IPython/html/static/notebook/js/actions.js
index 05d2d37..13ff5b5 100644
--- a/IPython/html/static/notebook/js/actions.js
+++ b/IPython/html/static/notebook/js/actions.js
@@ -1,8 +1,7 @@
 // Copyright (c) IPython Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-define(['require'
-], function(require) {
+define(function(require){
     "use strict";
     
     var ActionHandler = function (env) {
@@ -36,7 +35,7 @@ define(['require'
      *  but is considered undefined behavior.
      *
      **/
-    var _action = {
+    var _actions = {
         'run-select-next': {
             icon: 'fa-play',
             help    : 'run cell, select below',
@@ -387,31 +386,36 @@ define(['require'
     // Will actually generate/register all the IPython actions
     var fun = function(){
         var final_actions = {};
-        for(var k in _action){
-            // Js closure are function level not block level need to wrap in a IIFE
-            // and append ipython to event name these things do intercept event so are wrapped
-            // in a function that return false.
-            var handler = _prepare_handler(final_actions, k, _action);
-            (function(key, handler){
-                final_actions['ipython.'+key].handler = function(env, event){
-                    handler(env);
-                    if(event){
-                        event.preventDefault();
-                    }
-                    return false;
-                };
-            })(k, handler);
+        var k;
+        for(k in _actions){
+            if(_actions.hasOwnProperty(k)){
+                // Js closure are function level not block level need to wrap in a IIFE
+                // and append ipython to event name these things do intercept event so are wrapped
+                // in a function that return false.
+                var handler = _prepare_handler(final_actions, k, _actions);
+                (function(key, handler){
+                    final_actions['ipython.'+key].handler = function(env, event){
+                        handler(env);
+                        if(event){
+                            event.preventDefault();
+                        }
+                        return false;
+                    };
+                })(k, handler);
+            }
         }
 
-        for(var k in custom_ignore){
+        for(k in custom_ignore){
             // Js closure are function level not block level need to wrap in a IIFE
             // same as above, but decide for themselves wether or not they intercept events.
-            var handler = _prepare_handler(final_actions, k, custom_ignore);
-            (function(key, handler){
-                final_actions['ipython.'+key].handler = function(env, event){
-                    return handler(env, event);
-                };
-            })(k, handler);
+            if(custom_ignore.hasOwnProperty(k)){
+                var handler = _prepare_handler(final_actions, k, custom_ignore);
+                (function(key, handler){
+                    final_actions['ipython.'+key].handler = function(env, event){
+                        return handler(env, event);
+                    };
+                })(k, handler);
+            }
         }
 
         return final_actions;
diff --git a/IPython/html/static/notebook/js/codecell.js b/IPython/html/static/notebook/js/codecell.js
index 3e3bac3..58302b7 100644
--- a/IPython/html/static/notebook/js/codecell.js
+++ b/IPython/html/static/notebook/js/codecell.js
@@ -40,7 +40,7 @@ define([
     var Cell = cell.Cell;
 
     /* local util for codemirror */
-    var posEq = function(a, b) {return a.line == b.line && a.ch == b.ch;};
+    var posEq = function(a, b) {return a.line === b.line && a.ch === b.ch;};
 
     /**
      *
@@ -332,7 +332,7 @@ define([
         // whatever key is pressed, first, cancel the tooltip request before
         // they are sent, and remove tooltip if any, except for tab again
         var tooltip_closed = null;
-        if (event.type === 'keydown' && event.which != keycodes.tab ) {
+        if (event.type === 'keydown' && event.which !== keycodes.tab ) {
             tooltip_closed = this.tooltip.remove_and_cancel_tooltip();
         }
 
@@ -366,7 +366,7 @@ define([
                 if (editor.somethingSelected() || editor.getSelections().length !== 1){
                     var anchor = editor.getCursor("anchor");
                     var head = editor.getCursor("head");
-                    if( anchor.line != head.line){
+                    if( anchor.line !== head.line){
                         return false;
                     }
                 }
@@ -374,7 +374,7 @@ define([
                 event.codemirrorIgnore = true;
                 event.preventDefault();
                 return true;
-        } else if (event.keyCode === keycodes.tab && event.type == 'keydown') {
+        } else if (event.keyCode === keycodes.tab && event.type === 'keydown') {
             // Tab completion.
             this.tooltip.remove_and_cancel_tooltip();
 
diff --git a/IPython/html/static/notebook/js/menubar.js b/IPython/html/static/notebook/js/menubar.js
index af04c8f..85eb9f7 100644
--- a/IPython/html/static/notebook/js/menubar.js
+++ b/IPython/html/static/notebook/js/menubar.js
@@ -371,7 +371,6 @@ define([
          * Set the 'Download as foo' menu option for the relevant language.
          */
         var el = this.element.find('#download_script');
-        var that = this;
         
         // Set menu entry text to e.g. "Python (.py)"
         var langname = (langinfo.name || 'Script')
diff --git a/IPython/html/static/notebook/js/notebook.js b/IPython/html/static/notebook/js/notebook.js
index 94be416..9bc5db5 100644
--- a/IPython/html/static/notebook/js/notebook.js
+++ b/IPython/html/static/notebook/js/notebook.js
@@ -347,7 +347,7 @@ define([
         if (value === undefined) {
             value = true;
         }
-        if (this.dirty == value) {
+        if (this.dirty === value) {
             return;
         }
         this.events.trigger('set_dirty.Notebook', {value: value});
@@ -1792,7 +1792,7 @@ define([
             cell_data = new_cells[i];
             new_cell = this.insert_cell_at_index(cell_data.cell_type, i);
             new_cell.fromJSON(cell_data);
-            if (new_cell.cell_type == 'code' && !new_cell.output_area.trusted) {
+            if (new_cell.cell_type === 'code' && !new_cell.output_area.trusted) {
                 trusted = false;
             }
         }
@@ -1818,7 +1818,7 @@ define([
         var trusted = true;
         for (var i=0; i<ncells; i++) {
             var cell = cells[i];
-            if (cell.cell_type == 'code' && !cell.output_area.trusted) {
+            if (cell.cell_type === 'code' && !cell.output_area.trusted) {
                 trusted = false;
             }
             cell_array[i] = cell.toJSON();
@@ -1829,7 +1829,7 @@ define([
             nbformat: this.nbformat,
             nbformat_minor: this.nbformat_minor
         };
-        if (trusted != this.trusted) {
+        if (trusted !== this.trusted) {
             this.trusted = trusted;
             this.events.trigger("trust_changed.Notebook", trusted);
         }
@@ -1957,7 +1957,7 @@ define([
             // round to 10 seconds, otherwise we will be setting a new interval too often
             interval = 10000 * Math.round(interval / 10000);
             // set new interval, if it's changed
-            if (interval != this.autosave_interval) {
+            if (interval !== this.autosave_interval) {
                 this.set_autosave_interval(interval);
             }
         }
@@ -1997,7 +1997,7 @@ define([
                         var cells = nb.get_cells();
                         for (var i = 0; i < cells.length; i++) {
                             var cell = cells[i];
-                            if (cell.cell_type == 'code') {
+                            if (cell.cell_type === 'code') {
                                 cell.output_area.trusted = true;
                             }
                         }
@@ -2264,7 +2264,7 @@ define([
         var found = false;
         for (var i = 0; i < this.checkpoints.length; i++) {
             var existing = this.checkpoints[i];
-            if (existing.id == checkpoint.id) {
+            if (existing.id === checkpoint.id) {
                 found = true;
                 this.checkpoints[i] = checkpoint;
                 break;
diff --git a/IPython/html/static/notebook/js/textcell.js b/IPython/html/static/notebook/js/textcell.js
index 2a7cf4b..6fd4bf4 100644
--- a/IPython/html/static/notebook/js/textcell.js
+++ b/IPython/html/static/notebook/js/textcell.js
@@ -125,7 +125,6 @@ define([
         var cont = Cell.prototype.unrender.apply(this);
         if (cont) {
             var text_cell = this.element;
-            var output = text_cell.find("div.text_cell_render");
             if (this.get_text() === this.placeholder) {
                 this.set_text('');
             }
diff --git a/IPython/html/static/terminal/js/main.js b/IPython/html/static/terminal/js/main.js
index 382dada..c3c8bc3 100644
--- a/IPython/html/static/terminal/js/main.js
+++ b/IPython/html/static/terminal/js/main.js
@@ -15,6 +15,7 @@ require([
     page,
     terminado
     ){
+    "use strict";
     page = new page.Page();
     // Test size: 25x80
     var termRowHeight = function(){ return 1.00 * $("#dummy-screen")[0].offsetHeight / 25;};
@@ -28,8 +29,8 @@ require([
     
     var header = $("#header")[0]
     function calculate_size() {
-        height = window.innerHeight - header.offsetHeight;
-        width = $('#terminado-container').width();
+        var height = window.innerHeight - header.offsetHeight;
+        var width = $('#terminado-container').width();
         var rows = Math.min(1000, Math.max(20, Math.floor(height/termRowHeight())-1));
         var cols = Math.min(1000, Math.max(40, Math.floor(width/termColWidth())-1));
         console.log("resize to :", rows , 'rows by ', cols, 'columns');
@@ -38,7 +39,7 @@ require([
     
     page.show_header();
     
-    size = calculate_size();
+    var size = calculate_size();
     var terminal = terminado.make_terminal($("#terminado-container")[0], size, ws_url);
     
     page.show_site();
diff --git a/IPython/html/static/terminal/js/terminado.js b/IPython/html/static/terminal/js/terminado.js
index 2fda37a..72dda7d 100644
--- a/IPython/html/static/terminal/js/terminado.js
+++ b/IPython/html/static/terminal/js/terminado.js
@@ -1,4 +1,5 @@
 define ([], function() {
+    "use strict";
     function make_terminal(element, size, ws_url) {
         var ws = new WebSocket(ws_url);
         var term = new Terminal({
@@ -21,7 +22,7 @@ define ([], function() {
             term.open(element);
             
             ws.onmessage = function(event) {
-                json_msg = JSON.parse(event.data);
+                var json_msg = JSON.parse(event.data);
                 switch(json_msg[0]) {
                     case "stdout":
                         term.write(json_msg[1]);
diff --git a/IPython/html/static/tree/js/terminallist.js b/IPython/html/static/tree/js/terminallist.js
index 8b16dce..3fab779 100644
--- a/IPython/html/static/tree/js/terminallist.js
+++ b/IPython/html/static/tree/js/terminallist.js
@@ -64,7 +64,6 @@ define([
     };
     
     TerminalList.prototype.load_terminals = function() {
-        var that = this;
         var url = utils.url_join_encode(this.base_url, 'api/terminals');
         $.ajax(url, {
             type: "GET",
@@ -78,7 +77,7 @@ define([
     TerminalList.prototype.terminals_loaded = function (data) {
         this.terminals = data;
         this.clear_list();
-        var item, path_name, term;
+        var item, term;
         for (var i=0; i < this.terminals.length; i++) {
             term = this.terminals[i];
             item = this.new_item(-1);
diff --git a/IPython/html/static/widgets/js/widget.js b/IPython/html/static/widgets/js/widget.js
index 6c8dad5..0a384b9 100644
--- a/IPython/html/static/widgets/js/widget.js
+++ b/IPython/html/static/widgets/js/widget.js
@@ -8,6 +8,7 @@ define(["widgets/js/manager",
         "base/js/utils",
         "base/js/namespace",
 ], function(widgetmanager, _, Backbone, $, utils, IPython){
+    "use strict";
 
     var WidgetModel = Backbone.Model.extend({
         constructor: function (widget_manager, model_id, comm) {
@@ -175,7 +176,7 @@ define(["widgets/js/manager",
 
         get_state: function() {
             // Get the serializable state of the model.
-            state = this.toJSON();
+            var state = this.toJSON();
             for (var key in state) {
                 if (state.hasOwnProperty(key)) {
                     state[key] = this._pack_models(state[key]);
@@ -587,7 +588,6 @@ define(["widgets/js/manager",
             /**
              * Update the css styling of this view.
              */
-            var e = this.$el;
             if (css === undefined) {return;}
             for (var i = 0; i < css.length; i++) {
                 // Apply the css traits to all elements that match the selector.
@@ -705,7 +705,7 @@ define(["widgets/js/manager",
              */
             var remove = remove_view || this._remove_view;
             var create = create_view || this._create_view;
-            var context = context || this._handler_context;
+            context = context || this._handler_context;
             var i = 0;
             // first, skip past the beginning of the lists if they are identical
             for (; i < new_models.length; i++) {
diff --git a/IPython/html/static/widgets/js/widget_box.js b/IPython/html/static/widgets/js/widget_box.js
index e7850ce..ca62551 100644
--- a/IPython/html/static/widgets/js/widget_box.js
+++ b/IPython/html/static/widgets/js/widget_box.js
@@ -7,6 +7,7 @@ define([
     "base/js/utils",
     "bootstrap",
 ], function(widget, $, utils){
+    "use strict";
 
     var BoxView = widget.DOMWidgetView.extend({
         initialize: function(){
diff --git a/IPython/html/static/widgets/js/widget_int.js b/IPython/html/static/widgets/js/widget_int.js
index 18af78e..ae7d2dd 100644
--- a/IPython/html/static/widgets/js/widget_int.js
+++ b/IPython/html/static/widgets/js/widget_int.js
@@ -260,11 +260,12 @@ define([
              * Calling model.set will trigger all of the other views of the 
              * model to update.
              */
+            var actual_value;
             if (this.model.get("_range")) {
-                var actual_value = ui.values.map(this._validate_slide_value);
+                actual_value = ui.values.map(this._validate_slide_value);
                 this.$readout.text(actual_value.join("-"));
             } else {
-                var actual_value = this._validate_slide_value(ui.value);
+                actual_value = this._validate_slide_value(ui.value);
                 this.$readout.text(actual_value);
             }
             this.model.set('value', actual_value, {updated_view: this});
diff --git a/IPython/html/static/widgets/js/widget_selectioncontainer.js b/IPython/html/static/widgets/js/widget_selectioncontainer.js
index a9bcfa2..8646ee1 100644
--- a/IPython/html/static/widgets/js/widget_selectioncontainer.js
+++ b/IPython/html/static/widgets/js/widget_selectioncontainer.js
@@ -168,7 +168,6 @@ define([
              * Called when view is rendered.
              */
             var uuid = 'tabs'+utils.uuid();
-            var that = this;
             this.$tabs = $('<div />', {id: uuid})
                 .addClass('nav')
                 .addClass('nav-tabs')
diff --git a/IPython/html/tests/notebook/markdown.js b/IPython/html/tests/notebook/markdown.js
index cafe19d..d11ac23 100644
--- a/IPython/html/tests/notebook/markdown.js
+++ b/IPython/html/tests/notebook/markdown.js
@@ -2,6 +2,7 @@
 // Test that a Markdown cell is rendered to HTML.
 //
 casper.notebook_test(function () {
+    "use strict";
     // Test JavaScript models.
     var output = this.evaluate(function () {
         IPython.notebook.to_markdown();
@@ -56,7 +57,7 @@ casper.notebook_test(function () {
     for (var idx=0; idx < levels.length; idx++) {
         var level = levels[idx];
         level_text = set_level(level);
-        hashes = new Array(level + 1).join('#');
+        var hashes = new Array(level + 1).join('#');
         this.test.assertEquals(level_text, hashes + ' ' + text, 'markdown set_heading_level ' + level);
     }
 });
diff --git a/IPython/html/tests/notebook/roundtrip.js b/IPython/html/tests/notebook/roundtrip.js
index 1523cf9..262a6b7 100644
--- a/IPython/html/tests/notebook/roundtrip.js
+++ b/IPython/html/tests/notebook/roundtrip.js
@@ -23,7 +23,7 @@ var svg = "\"<svg width='1cm' height='1cm' viewBox='0 0 1000 500'><defs><style>r
 // represetnation, while the original in-memory cell retains its long mimetype
 // name, and that fromJSON also gets its long mimetype name
 function assert_has(short_name, json, result, result2) {
-    long_name = mime[short_name];
+    var long_name = mime[short_name];
     this.test.assertFalse(json[0].data.hasOwnProperty(short_name),
             "toJSON()   representation doesn't use " + short_name);
     this.test.assertTrue(json[0].data.hasOwnProperty(long_name),
@@ -40,7 +40,7 @@ function assert_has(short_name, json, result, result2) {
 // 'png', etc) are not used.
 function check_output_area(output_type, keys) {
     this.wait_for_output(0);
-    json = this.evaluate(function() {
+    var json = this.evaluate(function() {
         var json = IPython.notebook.get_cell(0).output_area.toJSON();
         // appended cell will initially be empty, let's add some output
         IPython.notebook.get_cell(1).output_area.fromJSON(json);
diff --git a/IPython/html/tests/util.js b/IPython/html/tests/util.js
index 92bd3c0..3753fbd 100644
--- a/IPython/html/tests/util.js
+++ b/IPython/html/tests/util.js
@@ -422,8 +422,9 @@ casper.click_cell_editor = function(index) {
     // region of codemirror that the user can focus.
     this.evaluate(function (i) {
         var cm = IPython.notebook.get_cell(i).code_mirror;
-        if (cm.options.readOnly != "nocursor" && (document.activeElement != cm.display.input))
+        if (cm.options.readOnly != "nocursor" && (document.activeElement != cm.display.input)){
             cm.display.input.focus();
+        }
     }, {i: index});
 };
 
@@ -591,7 +592,7 @@ casper.assert_colors_equal = function (hex_color, local_color, msg) {
 
     // If the local color is rgb, clean it up and replace 
     if (local_color.substr(0,3).toLowerCase() == 'rgb') {
-        components = local_color.substr(3).split(',');
+        var components = local_color.substr(3).split(',');
         local_color = '';
         for (var i = 0; i < components.length; i++) {
             var part = parseInt(components[i]).toString(16);
diff --git a/IPython/html/tests/widgets/widget_bool.js b/IPython/html/tests/widgets/widget_bool.js
index 3586271..1d3ec62 100644
--- a/IPython/html/tests/widgets/widget_bool.js
+++ b/IPython/html/tests/widgets/widget_bool.js
@@ -1,5 +1,6 @@
 // Test widget bool class
 casper.notebook_test(function () {
+    "use strict";
 
     // Create a checkbox and togglebutton.
     var bool_index = this.append_cell(
@@ -57,7 +58,7 @@ casper.notebook_test(function () {
     });
 
     // Try changing the state of the widgets programatically.
-    index = this.append_cell(
+    var index = this.append_cell(
         'bool_widgets[0].value = False\n' +
         'bool_widgets[1].value = False\n' +
         'print("Success")');
@@ -88,4 +89,4 @@ casper.notebook_test(function () {
             'Toggle button is toggled. (3)');
 
     });
-});
\ No newline at end of file
+});
diff --git a/IPython/html/tests/widgets/widget_image.js b/IPython/html/tests/widgets/widget_image.js
index 5072155..0a79910 100644
--- a/IPython/html/tests/widgets/widget_image.js
+++ b/IPython/html/tests/widgets/widget_image.js
@@ -1,6 +1,7 @@
 // Test image class
 casper.notebook_test(function () {
-    index = this.append_cell(
+    "use strict";
+    var index = this.append_cell(
         'from IPython.html import widgets\n' + 
         'from IPython.display import display, clear_output\n' +
         'print("Success")');
@@ -45,4 +46,4 @@ casper.notebook_test(function () {
         var img_src = this.cell_element_function(image_index, img_selector, 'attr', ['src']);
         this.test.assert(img_src.indexOf(test_jpg) > -1, 'Image src data exists.');
     });    
-});
\ No newline at end of file
+});
diff --git a/IPython/utils/path.py b/IPython/utils/path.py
index dcd66e7..9b764c9 100644
--- a/IPython/utils/path.py
+++ b/IPython/utils/path.py
@@ -27,10 +27,6 @@ from IPython.utils import py3compat
 
 fs_encoding = sys.getfilesystemencoding()
 
-def _get_long_path_name(path):
-    """Dummy no-op."""
-    return path
-
 def _writable_dir(path):
     """Whether `path` is a directory, to which the user has write access."""
     return os.path.isdir(path) and os.access(path, os.W_OK)
@@ -61,6 +57,11 @@ if sys.platform == 'win32':
             return path
         else:
             return buf.value
+else:
+    def _get_long_path_name(path):
+        """Dummy no-op."""
+        return path
+
 
 
 def get_long_path_name(path):
diff --git a/IPython/utils/terminal.py b/IPython/utils/terminal.py
index 9b31f60..ff31045 100644
--- a/IPython/utils/terminal.py
+++ b/IPython/utils/terminal.py
@@ -35,23 +35,18 @@ from . import py3compat
 ignore_termtitle = True
 
 
-def _term_clear():
-    pass
-
 
 if os.name == 'posix':
     def _term_clear():
         os.system('clear')
-
-
-if sys.platform == 'win32':
+elif sys.platform == 'win32':
     def _term_clear():
         os.system('cls')
+else:
+    def _term_clear():
+        pass
 
 
-def term_clear():
-    _term_clear()
-
 
 def toggle_set_term_title(val):
     """Control whether set_term_title is active or not.
@@ -85,9 +80,7 @@ if os.name == 'posix':
     TERM = os.environ.get('TERM','')
     if TERM.startswith('xterm'):
         _set_term_title = _set_term_title_xterm
-
-
-if sys.platform == 'win32':
+elif sys.platform == 'win32':
     try:
         import ctypes
 
@@ -127,10 +120,6 @@ def freeze_term_title():
     ignore_termtitle = True
 
 
-def get_terminal_size(defaultx=80, defaulty=25):
-    return defaultx, defaulty
-
-
 if sys.platform == 'win32':
     def get_terminal_size(defaultx=80, defaulty=25):
         """Return size of current terminal console.
@@ -161,4 +150,7 @@ if sys.platform == 'win32':
             return (sizex, sizey)
         else:
             return (defaultx, defaulty)
+else:
+    def get_terminal_size(defaultx=80, defaulty=25):
+        return defaultx, defaulty
 
diff --git a/IPython/utils/tests/test_tokenutil.py b/IPython/utils/tests/test_tokenutil.py
index 986adf8..be9cb57 100644
--- a/IPython/utils/tests/test_tokenutil.py
+++ b/IPython/utils/tests/test_tokenutil.py
@@ -16,7 +16,6 @@ def expect_token(expected, cell, cursor_pos):
             offset += len(line)
     column = cursor_pos - offset
     line_with_cursor = '%s|%s' % (line[:column], line[column:])
-    line
     nt.assert_equal(token, expected,
         "Expected %r, got %r in: %r (pos %i)" % (
         expected, token, line_with_cursor, cursor_pos)
diff --git a/setup.py b/setup.py
index 3503a8a..7ba39ff 100755
--- a/setup.py
+++ b/setup.py
@@ -298,7 +298,7 @@ if 'setuptools' in sys.modules:
     if 'bdist_wininst' in sys.argv:
         if len(sys.argv) > 2 and \
                ('sdist' in sys.argv or 'bdist_rpm' in sys.argv):
-            print >> sys.stderr, "ERROR: bdist_wininst must be run alone. Exiting."
+            print("ERROR: bdist_wininst must be run alone. Exiting.", file=sys.stderr)
             sys.exit(1)
         setup_args['data_files'].append(
             ['Scripts', ('scripts/ipython.ico', 'scripts/ipython_nb.ico')])