Merge pull request #4398 from Carreau/no-tooltip-on-tab

[Notebook] Deactivate tooltip on tab by default.

docs/source/whatsnew/pr/tooltip-on-tab.rst

@@ -0,0 +1,3
+ * In notebook, Showing tooltip on tab has been disables to avoid conflict with
+   completion, Shift-Tab could still be used to invoke tooltip when inside
+   function signature and/or on selection.

IPython/html/static/notebook/js/codecell.js

@@ -1,466 +1,460
 //----------------------------------------------------------------------------
 //  Copyright (C) 2008-2011  The IPython Development Team
 //
 //  Distributed under the terms of the BSD License.  The full license is in
 //  the file COPYING, distributed as part of this software.
 //----------------------------------------------------------------------------
 
 //============================================================================
 // CodeCell
 //============================================================================
 /**
  * An extendable module that provide base functionnality to create cell for notebook.
  * @module IPython
  * @namespace IPython
  * @submodule CodeCell
  */
 
 
 /* local util for codemirror */
 var posEq = function(a, b) {return a.line == b.line && a.ch == b.ch;};
 
 /**
  *
  * function to delete until previous non blanking space character
  * or first multiple of 4 tabstop.
  * @private
  */
 CodeMirror.commands.delSpaceToPrevTabStop = function(cm){
     var from = cm.getCursor(true), to = cm.getCursor(false), sel = !posEq(from, to);
     if (!posEq(from, to)) { cm.replaceRange("", from, to); return; }
     var cur = cm.getCursor(), line = cm.getLine(cur.line);
     var tabsize = cm.getOption('tabSize');
     var chToPrevTabStop = cur.ch-(Math.ceil(cur.ch/tabsize)-1)*tabsize;
     from = {ch:cur.ch-chToPrevTabStop,line:cur.line};
     var select = cm.getRange(from,cur);
     if( select.match(/^\ +$/) !== null){
         cm.replaceRange("",from,cur);
     } else {
         cm.deleteH(-1,"char");
     }
 };
 
 
 var IPython = (function (IPython) {
     "use strict";
 
     var utils = IPython.utils;
     var key   = IPython.utils.keycodes;
 
     /**
      * A Cell conceived to write code.
      *
      * The kernel doesn't have to be set at creation time, in that case
      * it will be null and set_kernel has to be called later.
      * @class CodeCell
      * @extends IPython.Cell
      *
      * @constructor
      * @param {Object|null} kernel
      * @param {object|undefined} [options]
      *      @param [options.cm_config] {object} config to pass to CodeMirror
      */
     var CodeCell = function (kernel, options) {
         this.kernel = kernel || null;
         this.code_mirror = null;
         this.input_prompt_number = null;
         this.collapsed = false;
         this.cell_type = "code";
 
 
         var cm_overwrite_options  = {
             onKeyEvent: $.proxy(this.handle_codemirror_keyevent,this)
         };
 
         options = this.mergeopt(CodeCell, options, {cm_config:cm_overwrite_options});
 
         IPython.Cell.apply(this,[options]);
 
         var that = this;
         this.element.focusout(
             function() { that.auto_highlight(); }
         );
     };
 
     CodeCell.options_default = {
         cm_config : {
             extraKeys: {
                 "Tab" :  "indentMore",
                 "Shift-Tab" : "indentLess",
                 "Backspace" : "delSpaceToPrevTabStop",
                 "Cmd-/" : "toggleComment",
                 "Ctrl-/" : "toggleComment"
             },
             mode: 'ipython',
             theme: 'ipython',
             matchBrackets: true
         }
     };
 
 
     CodeCell.prototype = new IPython.Cell();
 
     /**
      * @method auto_highlight
      */
     CodeCell.prototype.auto_highlight = function () {
         this._auto_highlight(IPython.config.cell_magic_highlight);
     };
 
     /** @method create_element */
     CodeCell.prototype.create_element = function () {
         IPython.Cell.prototype.create_element.apply(this, arguments);
 
         var cell =  $('<div></div>').addClass('cell border-box-sizing code_cell');
         cell.attr('tabindex','2');
 
         this.celltoolbar = new IPython.CellToolbar(this);
 
         var input = $('<div></div>').addClass('input');
         var vbox = $('<div/>').addClass('vbox box-flex1');
         input.append($('<div/>').addClass('prompt input_prompt'));
         vbox.append(this.celltoolbar.element);
         var input_area = $('<div/>').addClass('input_area');
         this.code_mirror = CodeMirror(input_area.get(0), this.cm_config);
         $(this.code_mirror.getInputField()).attr("spellcheck", "false");
         vbox.append(input_area);
         input.append(vbox);
         var output = $('<div></div>');
         cell.append(input).append(output);
         this.element = cell;
         this.output_area = new IPython.OutputArea(output, true);
 
         // construct a completer only if class exist
         // otherwise no print view
         if (IPython.Completer !== undefined)
         {
             this.completer = new IPython.Completer(this);
         }
     };
 
     /**
      *  This method gets called in CodeMirror's onKeyDown/onKeyPress
      *  handlers and is used to provide custom key handling. Its return
      *  value is used to determine if CodeMirror should ignore the event:
      *  true = ignore, false = don't ignore.
      *  @method handle_codemirror_keyevent
      */
     CodeCell.prototype.handle_codemirror_keyevent = function (editor, event) {
 
         var that = this;
         // whatever key is pressed, first, cancel the tooltip request before
         // they are sent, and remove tooltip if any, except for tab again
         if (event.type === 'keydown' && event.which != key.TAB ) {
             IPython.tooltip.remove_and_cancel_tooltip();
         }
 
         var cur = editor.getCursor();
         if (event.keyCode === key.ENTER){
             this.auto_highlight();
         }
 
         if (event.keyCode === key.ENTER && (event.shiftKey || event.ctrlKey)) {
             // Always ignore shift-enter in CodeMirror as we handle it.
             return true;
         } else if (event.which === 40 && event.type === 'keypress' && IPython.tooltip.time_before_tooltip >= 0) {
             // triger on keypress (!) otherwise inconsistent event.which depending on plateform
             // browser and keyboard layout !
             // Pressing '(' , request tooltip, don't forget to reappend it
             // The second argument says to hide the tooltip if the docstring
             // is actually empty
             IPython.tooltip.pending(that, true);
         } else if (event.which === key.UPARROW && event.type === 'keydown') {
             // If we are not at the top, let CM handle the up arrow and
             // prevent the global keydown handler from handling it.
             if (!that.at_top()) {
                 event.stop();
                 return false;
             } else {
                 return true;
             }
         } else if (event.which === key.ESC) {
             return IPython.tooltip.remove_and_cancel_tooltip(true);
         } else if (event.which === key.DOWNARROW && event.type === 'keydown') {
             // If we are not at the bottom, let CM handle the down arrow and
             // prevent the global keydown handler from handling it.
             if (!that.at_bottom()) {
                 event.stop();
                 return false;
             } else {
                 return true;
             }
         } else if (event.keyCode === key.TAB && event.type == 'keydown' && event.shiftKey) {
                 if (editor.somethingSelected()){
                     var anchor = editor.getCursor("anchor");
                     var head = editor.getCursor("head");
                     if( anchor.line != head.line){
                         return false;
                     }
                 }
                 IPython.tooltip.request(that);
                 event.stop();
                 return true;
         } else if (event.keyCode === key.TAB && event.type == 'keydown') {
             // Tab completion.
             //Do not trim here because of tooltip
             if (editor.somethingSelected()) { return false; }
             var pre_cursor = editor.getRange({line:cur.line,ch:0},cur);
             if (pre_cursor.trim() === "") {
                 // Don't autocomplete if the part of the line before the cursor
                 // is empty.  In this case, let CodeMirror handle indentation.
                 return false;
-            } else if ((pre_cursor.substr(-1) === "("|| pre_cursor.substr(-1) === " ") && IPython.config.tooltip_on_tab ) {
-                IPython.tooltip.request(that);
-                // Prevent the event from bubbling up.
-                event.stop();
-                // Prevent CodeMirror from handling the tab.
-                return true;
             } else {
                 event.stop();
                 this.completer.startCompletion();
                 return true;
             }
         } else {
             // keypress/keyup also trigger on TAB press, and we don't want to
             // use those to disable tab completion.
             return false;
         }
         return false;
     };
 
 
     // Kernel related calls.
 
     CodeCell.prototype.set_kernel = function (kernel) {
         this.kernel = kernel;
     };
 
     /**
      * Execute current code cell to the kernel
      * @method execute
      */
     CodeCell.prototype.execute = function () {
         this.output_area.clear_output();
         this.set_input_prompt('*');
         this.element.addClass("running");
         if (this.last_msg_id) {
             this.kernel.clear_callbacks_for_msg(this.last_msg_id);
         }
         var callbacks = this.get_callbacks();
         
         this.last_msg_id = this.kernel.execute(this.get_text(), callbacks, {silent: false, store_history: true});
     };
     
     /**
      * Construct the default callbacks for
      * @method get_callbacks
      */
     CodeCell.prototype.get_callbacks = function () {
         return {
             shell : {
                 reply : $.proxy(this._handle_execute_reply, this),
                 payload : {
                     set_next_input : $.proxy(this._handle_set_next_input, this),
                     page : $.proxy(this._open_with_pager, this)
                 }
             },
             iopub : {
                 output : $.proxy(this.output_area.handle_output, this.output_area),
                 clear_output : $.proxy(this.output_area.handle_clear_output, this.output_area),
             },
             input : $.proxy(this._handle_input_request, this)
         };
     };
     
     CodeCell.prototype._open_with_pager = function (payload) {
         $([IPython.events]).trigger('open_with_text.Pager', payload);
     };
 
     /**
      * @method _handle_execute_reply
      * @private
      */
     CodeCell.prototype._handle_execute_reply = function (msg) {
         this.set_input_prompt(msg.content.execution_count);
         this.element.removeClass("running");
         $([IPython.events]).trigger('set_dirty.Notebook', {value: true});
     };
 
     /**
      * @method _handle_set_next_input
      * @private
      */
     CodeCell.prototype._handle_set_next_input = function (payload) {
         var data = {'cell': this, 'text': payload.text};
         $([IPython.events]).trigger('set_next_input.Notebook', data);
     };
 
     /**
      * @method _handle_input_request
      * @private
      */
     CodeCell.prototype._handle_input_request = function (msg) {
         this.output_area.append_raw_input(msg);
     };
 
 
     // Basic cell manipulation.
 
     CodeCell.prototype.select = function () {
         IPython.Cell.prototype.select.apply(this);
         this.code_mirror.refresh();
         this.code_mirror.focus();
         this.auto_highlight();
         // We used to need an additional refresh() after the focus, but
         // it appears that this has been fixed in CM. This bug would show
         // up on FF when a newly loaded markdown cell was edited.
     };
 
 
     CodeCell.prototype.select_all = function () {
         var start = {line: 0, ch: 0};
         var nlines = this.code_mirror.lineCount();
         var last_line = this.code_mirror.getLine(nlines-1);
         var end = {line: nlines-1, ch: last_line.length};
         this.code_mirror.setSelection(start, end);
     };
 
 
     CodeCell.prototype.collapse = function () {
         this.collapsed = true;
         this.output_area.collapse();
     };
 
 
     CodeCell.prototype.expand = function () {
         this.collapsed = false;
         this.output_area.expand();
     };
 
 
     CodeCell.prototype.toggle_output = function () {
         this.collapsed = Boolean(1 - this.collapsed);
         this.output_area.toggle_output();
     };
 
 
     CodeCell.prototype.toggle_output_scroll = function () {
     this.output_area.toggle_scroll();
     };
 
 
     CodeCell.input_prompt_classical = function (prompt_value, lines_number) {
         var ns = prompt_value || "&nbsp;";
         return 'In&nbsp;[' + ns + ']:';
     };
 
     CodeCell.input_prompt_continuation = function (prompt_value, lines_number) {
         var html = [CodeCell.input_prompt_classical(prompt_value, lines_number)];
         for(var i=1; i < lines_number; i++) {
             html.push(['...:']);
         }
         return html.join('<br/>');
     };
 
     CodeCell.input_prompt_function = CodeCell.input_prompt_classical;
 
 
     CodeCell.prototype.set_input_prompt = function (number) {
         var nline = 1;
         if (this.code_mirror !== undefined) {
            nline = this.code_mirror.lineCount();
         }
         this.input_prompt_number = number;
         var prompt_html = CodeCell.input_prompt_function(this.input_prompt_number, nline);
         this.element.find('div.input_prompt').html(prompt_html);
     };
 
 
     CodeCell.prototype.clear_input = function () {
         this.code_mirror.setValue('');
     };
 
 
     CodeCell.prototype.get_text = function () {
         return this.code_mirror.getValue();
     };
 
 
     CodeCell.prototype.set_text = function (code) {
         return this.code_mirror.setValue(code);
     };
 
 
     CodeCell.prototype.at_top = function () {
         var cursor = this.code_mirror.getCursor();
         if (cursor.line === 0 && cursor.ch === 0) {
             return true;
         } else {
             return false;
         }
     };
 
 
     CodeCell.prototype.at_bottom = function () {
         var cursor = this.code_mirror.getCursor();
         if (cursor.line === (this.code_mirror.lineCount()-1) && cursor.ch === this.code_mirror.getLine(cursor.line).length) {
             return true;
         } else {
             return false;
         }
     };
 
 
     CodeCell.prototype.clear_output = function (wait) {
         this.output_area.clear_output(wait);
     };
 
 
     // JSON serialization
 
     CodeCell.prototype.fromJSON = function (data) {
         IPython.Cell.prototype.fromJSON.apply(this, arguments);
         if (data.cell_type === 'code') {
             if (data.input !== undefined) {
                 this.set_text(data.input);
                 // make this value the starting point, so that we can only undo
                 // to this state, instead of a blank cell
                 this.code_mirror.clearHistory();
                 this.auto_highlight();
             }
             if (data.prompt_number !== undefined) {
                 this.set_input_prompt(data.prompt_number);
             } else {
                 this.set_input_prompt();
             }
             this.output_area.fromJSON(data.outputs);
             if (data.collapsed !== undefined) {
                 if (data.collapsed) {
                     this.collapse();
                 } else {
                     this.expand();
                 }
             }
         }
     };
 
 
     CodeCell.prototype.toJSON = function () {
         var data = IPython.Cell.prototype.toJSON.apply(this);
         data.input = this.get_text();
         data.cell_type = 'code';
         if (this.input_prompt_number) {
             data.prompt_number = this.input_prompt_number;
         }
         var outputs = this.output_area.toJSON();
         data.outputs = outputs;
         data.language = 'python';
         data.collapsed = this.collapsed;
         return data;
     };
 
 
     IPython.CodeCell = CodeCell;
 
     return IPython;
 }(IPython));

IPython/html/static/notebook/js/config.js

@@ -1,80 +1,79
 //----------------------------------------------------------------------------
 //  Copyright (C) 2012  The IPython Development Team
 //
 //  Distributed under the terms of the BSD License.  The full license is in
 //  the file COPYING, distributed as part of this software.
 //----------------------------------------------------------------------------
 
 //============================================================================
 // Notebook
 //============================================================================
 
 /**
  * @module IPython
  * @namespace IPython
  **/
 
 var IPython = (function (IPython) {
     "use strict";
         /**
          * A place where some stuff can be confugured.
          *
          * @class config
          * @static
          *
          **/
     var default_config = {
         /**
          * Dictionary of object to autodetect highlight mode for code cell.
          * Item of the dictionnary should take the form :
          *
          *     key : {'reg':[list_of_regexp]}
          *
          * where `key` will be the code mirror mode name
          * and `list_of_regexp` should be a list of regext that should match
          * the first line of the cell to trigger this mode.
          *
          * if `key` is prefixed by the `magic_` prefix the codemirror `mode`
          * will be applied only at the end of the first line
          *
          * @attribute cell_magic_highlight
          * @example
          * This would trigger javascript mode
          * from the second line if first line start with `%%javascript` or `%%jsmagic`
          *
          *     cell_magic_highlight['magic_javascript'] = {'reg':[/^%%javascript/,/^%%jsmagic/]}
          * @example
          * This would trigger javascript mode
          * from the second line if first line start with `var`
          *
          *     cell_magic_highlight['javascript'] = {'reg':[/^var/]}
          */
         cell_magic_highlight : {
               'magic_javascript'    :{'reg':[/^%%javascript/]}
              ,'magic_perl'          :{'reg':[/^%%perl/]}
              ,'magic_ruby'          :{'reg':[/^%%ruby/]}
              ,'magic_python'        :{'reg':[/^%%python3?/]}
              ,'magic_shell'         :{'reg':[/^%%bash/]}
              ,'magic_r'             :{'reg':[/^%%R/]}
              ,'magic_text/x-cython' :{'reg':[/^%%cython/]}
             },
 
         /**
          * same as `cell_magic_highlight` but for raw cells
          * @attribute raw_cell_highlight
          */
         raw_cell_highlight : {
              'diff'         :{'reg':[/^diff/]}
             },
 
-        tooltip_on_tab : true,
         };
 
     // use the same method to merge user configuration
     IPython.config = {};
     $.extend(IPython.config, default_config);
 
     return IPython;
 
 }(IPython));
 

examples/notebooks/Part 1 - Running Code.ipynb

@@ -1,439 +1,439
 {
  "metadata": {
   "name": ""
  },
  "nbformat": 3,
  "nbformat_minor": 0,
  "worksheets": [
   {
    "cells": [
     {
      "cell_type": "heading",
      "level": 1,
      "metadata": {},
      "source": [
       "Running Code in the IPython Notebook"
      ]
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
       "First and foremost, the IPython Notebook is an interactive environment for writing and running Python code."
      ]
     },
     {
      "cell_type": "heading",
      "level": 2,
      "metadata": {},
      "source": [
       "Code cells allow you to enter and run Python code"
      ]
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
       "Run a code cell using `Shift-Enter` or pressing the \"Play\" button in the toolbar above:"
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "a = 10"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [],
      "prompt_number": 10
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "print(a)"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [
       {
        "output_type": "stream",
        "stream": "stdout",
        "text": [
         "10\n"
        ]
       }
      ],
      "prompt_number": 11
     },
     {
      "cell_type": "heading",
      "level": 2,
      "metadata": {},
      "source": [
       "Managing the IPython Kernel"
      ]
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
       "Code is run in a separate process called the IPython Kernel.  The Kernel can be interrupted or restarted.  Try running the following cell and then hit the \"Stop\" button in the toolbar above."
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "import time\n",
       "time.sleep(10)"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [
       {
        "ename": "KeyboardInterrupt",
        "evalue": "",
        "output_type": "pyerr",
        "traceback": [
         "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mKeyboardInterrupt\u001b[0m                         Traceback (most recent call last)",
         "\u001b[0;32m<ipython-input-16-d7b436e260d5>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m      1\u001b[0m \u001b[0;32mimport\u001b[0m \u001b[0mtime\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m \u001b[0mtime\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0msleep\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;36m10\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
         "\u001b[0;31mKeyboardInterrupt\u001b[0m: "
        ]
       }
      ],
      "prompt_number": 16
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
       "If the Kernel dies you will be prompted to restart it. Here we call the low-level system libc.time routine with the wrong argument via\n",
       "ctypes to segfault the Python interpreter:"
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "import sys\n",
       "from ctypes import CDLL\n",
       "# This will crash a Linux or Mac system; equivalent calls can be made on Windows\n",
       "dll = 'dylib' if sys.platform == 'darwin' else 'so.6'\n",
       "libc = CDLL(\"libc.%s\" % dll) \n",
       "libc.time(-1)  # BOOM!!"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [],
      "prompt_number": "*"
     },
     {
      "cell_type": "heading",
      "level": 2,
      "metadata": {},
      "source": [
       "All of the goodness of IPython works"
      ]
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
       "Here are two system aliases:"
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "pwd"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [
       {
        "output_type": "pyout",
        "prompt_number": 4,
        "text": [
         "u'/Users/bgranger/Documents/Computation/IPython/code/ipython/examples/notebooks'"
        ]
       }
      ],
      "prompt_number": 4
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "ls"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [
       {
        "output_type": "stream",
        "stream": "stdout",
        "text": [
         "01_notebook_introduction.ipynb        Octave Magic.ipynb\r\n",
         "Animations Using clear_output.ipynb   PyLab and Matplotlib.ipynb\r\n",
         "Basic Output.ipynb                    R Magics.ipynb\r\n",
         "Custom Display Logic.ipynb            Running Code.ipynb\r\n",
         "Cython Magics.ipynb                   Script Magics.ipynb\r\n",
         "Data Publication API.ipynb            SymPy Examples.ipynb\r\n",
         "Display System.ipynb                  Trapezoid Rule.ipynb\r\n",
         "JS Progress Bar.ipynb                 Typesetting Math Using MathJax.ipynb\r\n",
         "Local Files.ipynb                     animation.m4v\r\n",
         "Markdown Cells.ipynb                  python-logo.svg\r\n",
         "Notebook Tour.ipynb\r\n"
        ]
       }
      ],
      "prompt_number": 2
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
       "Any command line program can be run using `!` with string interpolation from Python variables:"
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "message = 'The IPython notebook is great!'\n",
       "# note: the echo command does not run on Windows, it's a unix command.\n",
       "!echo $message"
      ],
      "language": "python",
      "metadata": {},
      "outputs": []
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
       "Tab completion works:"
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "import numpy\n",
       "numpy.random."
      ],
      "language": "python",
      "metadata": {},
      "outputs": [],
      "prompt_number": 9
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      "Tab completion after `(` brings up a tooltip with the docstring:"
+      "Shift-Tab on selection, or after `(` brings up a tooltip with the docstring:"
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "numpy.random.rand("
      ],
      "language": "python",
      "metadata": {},
      "outputs": []
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
       "Adding `?` opens the docstring in the pager below:"
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "magic?"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [],
      "prompt_number": 8
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
       "Exceptions are formatted nicely:"
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "x = 1\n",
       "y = 4\n",
       "z = y/(1-x)"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [
       {
        "ename": "ZeroDivisionError",
        "evalue": "integer division or modulo by zero",
        "output_type": "pyerr",
        "traceback": [
         "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mZeroDivisionError\u001b[0m                         Traceback (most recent call last)",
         "\u001b[0;32m<ipython-input-15-dc39888fd1d2>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m      1\u001b[0m \u001b[0mx\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;36m1\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      2\u001b[0m \u001b[0my\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;36m4\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 3\u001b[0;31m \u001b[0mz\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0my\u001b[0m\u001b[0;34m/\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m-\u001b[0m\u001b[0mx\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
         "\u001b[0;31mZeroDivisionError\u001b[0m: integer division or modulo by zero"
        ]
       }
      ],
      "prompt_number": 15
     },
     {
      "cell_type": "heading",
      "level": 2,
      "metadata": {},
      "source": [
       "Working with external code"
      ]
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
       "There are a number of ways of getting external code into code cells."
      ]
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
       "Pasting code with `>>>` prompts works as expected:"
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       ">>> the_world_is_flat = 1\n",
       ">>> if the_world_is_flat:\n",
       "...     print(\"Be careful not to fall off!\")"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [
       {
        "output_type": "stream",
        "stream": "stdout",
        "text": [
         "Be careful not to fall off!\n"
        ]
       }
      ],
      "prompt_number": 1
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
       "The `%load` magic lets you load code from URLs or local files:"
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "%load?"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [],
      "prompt_number": 14
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "%matplotlib inline"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [],
      "prompt_number": 1
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "%load http://matplotlib.sourceforge.net/mpl_examples/pylab_examples/integral_demo.py"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [],
      "prompt_number": 2
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "#!/usr/bin/env python\n",
       "\n",
       "# implement the example graphs/integral from pyx\n",
       "from pylab import *\n",
       "from matplotlib.patches import Polygon\n",
       "\n",
       "def func(x):\n",
       "    return (x-3)*(x-5)*(x-7)+85\n",
       "\n",
       "ax = subplot(111)\n",
       "\n",
       "a, b = 2, 9 # integral area\n",
       "x = arange(0, 10, 0.01)\n",
       "y = func(x)\n",
       "plot(x, y, linewidth=1)\n",
       "\n",
       "# make the shaded region\n",
       "ix = arange(a, b, 0.01)\n",
       "iy = func(ix)\n",
       "verts = [(a,0)] + list(zip(ix,iy)) + [(b,0)]\n",
       "poly = Polygon(verts, facecolor='0.8', edgecolor='k')\n",
       "ax.add_patch(poly)\n",
       "\n",
       "text(0.5 * (a + b), 30,\n",
       "     r\"$\\int_a^b f(x)\\mathrm{d}x$\", horizontalalignment='center',\n",
       "     fontsize=20)\n",
       "\n",
       "axis([0,10, 0, 180])\n",
       "figtext(0.9, 0.05, 'x')\n",
       "figtext(0.1, 0.9, 'y')\n",
       "ax.set_xticks((a,b))\n",
       "ax.set_xticklabels(('a','b'))\n",
       "ax.set_yticks([])\n",
       "show()\n"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [
       {
        "metadata": {},
        "output_type": "display_data",
        "png": 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        "text": [
         "<matplotlib.figure.Figure at 0x110035290>"
        ]
       }
      ],
      "prompt_number": 3
     }
    ],
    "metadata": {}
   }
  ]
-}
  No newline at end of file
+}