Backport PR #6706: Correctly display prompt numbers that are 'None'

Fixes  #6702

IPython/html/tests/notebook/prompt_numbers.js

@@ -0,0 +1,36 b''
+
+// Test
+casper.notebook_test(function () {
+
+    var that = this;
+    var set_prompt = function (i, val) {
+        that.evaluate(function (i, val) {
+            var cell = IPython.notebook.get_cell(i);
+            cell.set_input_prompt(val);
+        }, [i, val]);
+    };
+
+    var get_prompt = function (i) {
+        return that.evaluate(function (i) {
+            var elem = IPython.notebook.get_cell(i).element;
+            return elem.find('div.input_prompt').html();
+        }, [i]);
+    };
+
+    this.then(function () {
+        var a = 'print("a")';
+        var index = this.append_cell(a);
+
+        this.test.assertEquals(get_prompt(index), "In [ ]:", "prompt number is   by default");
+        set_prompt(index, 2);
+        this.test.assertEquals(get_prompt(index), "In [2]:", "prompt number is 2");
+        set_prompt(index, 0);
+        this.test.assertEquals(get_prompt(index), "In [0]:", "prompt number is 0");
+        set_prompt(index, "*");
+        this.test.assertEquals(get_prompt(index), "In [*]:", "prompt number is *");
+        set_prompt(index, undefined);
+        this.test.assertEquals(get_prompt(index), "In [ ]:", "prompt number is  ");
+        set_prompt(index, null);
+        this.test.assertEquals(get_prompt(index), "In [ ]:", "prompt number is  ");
+    });
+});

IPython/nbconvert/exporters/tests/files/prompt_numbers.ipynb

@@ -0,0 +1,81 b''
+{
+ "metadata": {
+  "name": "notebook2"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import numpy as np"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "evs = np.zeros(100)",
+      "evs.shape"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 10,
+       "text": [
+        "(100,)"
+       ]
+      }
+     ],
+     "prompt_number": 10
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": null
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": "*"
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 0
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
  No newline at end of file

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

@@ -1,517 +1,517 b''
 //----------------------------------------------------------------------------
 //  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 keycodes = IPython.keyboard.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.collapsed = false;
 
         // create all attributed in constructor function
         // even if null for V8 VM optimisation
         this.input_prompt_number = null;
         this.celltoolbar = null;
         this.output_area = null;
         this.last_msg_id = null;
         this.completer = null;
 
 
         var cm_overwrite_options  = {
             onKeyEvent: $.proxy(this.handle_keyevent,this)
         };
 
         options = this.mergeopt(CodeCell, options, {cm_config:cm_overwrite_options});
 
         IPython.Cell.apply(this,[options]);
 
         // Attributes we want to override in this subclass.
         this.cell_type = "code";
 
         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,
              // don't auto-close strings because of CodeMirror #2385
             autoCloseBrackets: "()[]{}"
         }
     };
 
     CodeCell.msg_cells = {};
 
     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');
 
         var input = $('<div></div>').addClass('input');
         var prompt = $('<div/>').addClass('prompt input_prompt');
         var inner_cell = $('<div/>').addClass('inner_cell');
         this.celltoolbar = new IPython.CellToolbar(this);
         inner_cell.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");
         inner_cell.append(input_area);
         input.append(prompt).append(inner_cell);
 
         var widget_area = $('<div/>')
             .addClass('widget-area')
             .hide();
         this.widget_area = widget_area;
         var widget_prompt = $('<div/>')
             .addClass('prompt')
             .appendTo(widget_area);
         var widget_subarea = $('<div/>')
             .addClass('widget-subarea')
             .appendTo(widget_area);
         this.widget_subarea = widget_subarea;
         var widget_clear_buton = $('<button />')
             .addClass('close')
             .html('&times;')
             .click(function() {
                 widget_area.slideUp('', function(){ widget_subarea.html(''); });
                 })
             .appendTo(widget_prompt);
 
         var output = $('<div></div>');
         cell.append(input).append(widget_area).append(output);
         this.element = cell;
         this.output_area = new IPython.OutputArea(output, true);
         this.completer = new IPython.Completer(this);
     };
 
     /** @method bind_events */
     CodeCell.prototype.bind_events = function () {
         IPython.Cell.prototype.bind_events.apply(this);
         var that = this;
 
         this.element.focusout(
             function() { that.auto_highlight(); }
         );
     };
 
 
     /**
      *  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
         var tooltip_closed = null;
         if (event.type === 'keydown' && event.which != keycodes.tab ) {
             tooltip_closed = IPython.tooltip.remove_and_cancel_tooltip();
         }
 
         var cur = editor.getCursor();
         if (event.keyCode === keycodes.enter){
             this.auto_highlight();
         }
 
         if (event.which === keycodes.down && 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 ( tooltip_closed && event.which === keycodes.esc && event.type === 'keydown') {
             // If tooltip is active, cancel it.  The call to
             // remove_and_cancel_tooltip above doesn't pass, force=true.
             // Because of this it won't actually close the tooltip
             // if it is in sticky mode. Thus, we have to check again if it is open
             // and close it with force=true.
             if (!IPython.tooltip._hidden) {
                 IPython.tooltip.remove_and_cancel_tooltip(true);
             }
             // If we closed the tooltip, don't let CM or the global handlers
             // handle this event.
             event.stop();
             return true;
         } else if (event.keyCode === keycodes.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 === keycodes.tab && event.type == 'keydown') {
             // Tab completion.
             IPython.tooltip.remove_and_cancel_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 {
                 event.stop();
                 this.completer.startCompletion();
                 return true;
             }
         } 
         
         // keyboard event wasn't one of those unique to code cells, let's see
         // if it's one of the generic ones (i.e. check edit mode shortcuts)
         return IPython.Cell.prototype.handle_codemirror_keyevent.apply(this, [editor, event]);
     };
 
     // 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();
         
         // Clear widget area
         this.widget_subarea.html('');
         this.widget_subarea.height('');
         this.widget_area.height('');
         this.widget_area.hide();
 
         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();
         
         var old_msg_id = this.last_msg_id;
         this.last_msg_id = this.kernel.execute(this.get_text(), callbacks, {silent: false, store_history: true});
         if (old_msg_id) {
             delete CodeCell.msg_cells[old_msg_id];
         }
         CodeCell.msg_cells[this.last_msg_id] = this;
     };
     
     /**
      * 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 () {
         var cont = IPython.Cell.prototype.select.apply(this);
         if (cont) {
             this.code_mirror.refresh();
             this.auto_highlight();
         }
         return cont;
     };
 
     CodeCell.prototype.render = function () {
         var cont = IPython.Cell.prototype.render.apply(this);
         // Always execute, even if we are already in the rendered state
         return cont;
     };
     
     CodeCell.prototype.unrender = function () {
         // CodeCell is always rendered
         return false;
     };
 
     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_output = function () {
         this.collapsed = true;
         this.output_area.collapse();
     };
 
 
     CodeCell.prototype.expand_output = function () {
         this.collapsed = false;
         this.output_area.expand();
         this.output_area.unscroll_area();
     };
 
     CodeCell.prototype.scroll_output = function () {
         this.output_area.expand();
         this.output_area.scroll_if_long();
     };
 
     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;
-        if (prompt_value === undefined) {
+        if (prompt_value === undefined || prompt_value === null) {
             ns = "&nbsp;";
         } else {
             ns = encodeURIComponent(prompt_value);
         }
         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 HTML call is okay because the user contents are escaped.
         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.clear_output = function (wait) {
         this.output_area.clear_output(wait);
         this.set_input_prompt();
     };
 
 
     // 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.trusted = data.trusted || false;
             this.output_area.fromJSON(data.outputs);
             if (data.collapsed !== undefined) {
                 if (data.collapsed) {
                     this.collapse_output();
                 } else {
                     this.expand_output();
                 }
             }
         }
     };
 
 
     CodeCell.prototype.toJSON = function () {
         var data = IPython.Cell.prototype.toJSON.apply(this);
         data.input = this.get_text();
         // is finite protect against undefined and '*' value
         if (isFinite(this.input_prompt_number)) {
             data.prompt_number = this.input_prompt_number;
         }
         var outputs = this.output_area.toJSON();
         data.outputs = outputs;
         data.language = 'python';
         data.trusted = this.output_area.trusted;
         data.collapsed = this.collapsed;
         return data;
     };
 
     /**
      * handle cell level logic when a cell is unselected
      * @method unselect
      * @return is the action being taken
      */
     CodeCell.prototype.unselect = function () {
         var cont = IPython.Cell.prototype.unselect.apply(this);
         if (cont) {
             // When a code cell is usnelected, make sure that the corresponding
             // tooltip and completer to that cell is closed.
             IPython.tooltip.remove_and_cancel_tooltip(true);
             if (this.completer !== null) {
                 this.completer.close();
             }
         }
         return cont;
     };
 
     IPython.CodeCell = CodeCell;
 
     return IPython;
 }(IPython));

IPython/nbconvert/exporters/tests/test_html.py

@@ -1,61 +1,77 b''
 """Tests for HTMLExporter"""
 
 #-----------------------------------------------------------------------------
 # Copyright (c) 2013, the IPython Development Team.
 #
 # Distributed under the terms of the Modified BSD License.
 #
 # The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 from .base import ExportersTestsBase
 from ..html import HTMLExporter
 from IPython.testing.decorators import onlyif_any_cmd_exists
+import re
 
 #-----------------------------------------------------------------------------
 # Class
 #-----------------------------------------------------------------------------
 
 class TestHTMLExporter(ExportersTestsBase):
     """Tests for HTMLExporter"""
     
     exporter_class = HTMLExporter
     should_include_raw = ['html']
 
     def test_constructor(self):
         """
         Can a HTMLExporter be constructed?
         """
         HTMLExporter()
 
 
     @onlyif_any_cmd_exists('nodejs', 'node', 'pandoc')
     def test_export(self):
         """
         Can a HTMLExporter export something?
         """
         (output, resources) = HTMLExporter().from_filename(self._get_notebook())
         assert len(output) > 0
 
 
     @onlyif_any_cmd_exists('nodejs', 'node', 'pandoc')
     def test_export_basic(self):
         """
         Can a HTMLExporter export using the 'basic' template?
         """
         (output, resources) = HTMLExporter(template_file='basic').from_filename(self._get_notebook())
         assert len(output) > 0
 
 
     @onlyif_any_cmd_exists('nodejs', 'node', 'pandoc')
     def test_export_full(self):
         """
         Can a HTMLExporter export using the 'full' template?
         """
         (output, resources) = HTMLExporter(template_file='full').from_filename(self._get_notebook())
         assert len(output) > 0
 
+    @onlyif_any_cmd_exists('nodejs', 'node', 'pandoc')
+    def test_prompt_number(self):
+        """
+        Does HTMLExporter properly format input and output prompts?
+        """
+        (output, resources) = HTMLExporter(template_file='full').from_filename(
+            self._get_notebook(nb_name="prompt_numbers.ipynb"))
+        in_regex = r"In \[(.*)\]:"
+        out_regex = r"Out\[(.*)\]:"
+
+        ins = ["2", "10", " ", " ", "*", "0"]
+        outs = ["10"]
+
+        assert re.findall(in_regex, output) == ins
+        assert re.findall(out_regex, output) == outs

IPython/nbconvert/templates/html/basic.tpl

@@ -1,193 +1,201 b''
 {%- extends 'display_priority.tpl' -%}
 
 
 {% block codecell %}
 <div class="cell border-box-sizing code_cell rendered">
 {{ super() }}
 </div>
 {%- endblock codecell %}
 
 {% block input_group -%}
 <div class="input">
 {{ super() }}
 </div>
 {% endblock input_group %}
 
 {% block output_group %}
 <div class="output_wrapper">
 <div class="output">
 {{ super() }}
 </div>
 </div>
 {% endblock output_group %}
 
 {% block in_prompt -%}
 <div class="prompt input_prompt">
-In&nbsp;[{{ cell.prompt_number }}]:
+{%- if cell.prompt_number is defined -%}
+In&nbsp;[{{ cell.prompt_number|replace(None, "&nbsp;") }}]:
+{%- else -%}
+In&nbsp;[&nbsp;]:
+{%- endif -%}
 </div>
 {%- endblock in_prompt %}
 
 {% block empty_in_prompt -%}
 <div class="prompt input_prompt">
 </div>
 {%- endblock empty_in_prompt %}
 
 {# 
   output_prompt doesn't do anything in HTML,
   because there is a prompt div in each output area (see output block)
 #}
 {% block output_prompt %}
 {% endblock output_prompt %}
 
 {% block input %}
 <div class="inner_cell">
     <div class="input_area">
 {{ cell.input | highlight2html(language=resources.get('language'), metadata=cell.metadata) }}
 </div>
 </div>
 {%- endblock input %}
 
 {% block output %}
 <div class="output_area">
 {%- if output.output_type == 'pyout' -%}
     <div class="prompt output_prompt">
-    Out[{{ cell.prompt_number }}]:
+{%- if cell.prompt_number is defined -%}
+    Out[{{ cell.prompt_number|replace(None, "&nbsp;") }}]:
+{%- else -%}
+    Out[&nbsp;]:
+{%- endif -%}
 {%- else -%}
     <div class="prompt">
 {%- endif -%}
     </div>
 {{ super() }}
 </div>
 {% endblock output %}
 
 {% block markdowncell scoped %}
 <div class="cell border-box-sizing text_cell rendered">
 {{ self.empty_in_prompt() }}
 <div class="inner_cell">
 <div class="text_cell_render border-box-sizing rendered_html">
 {{ cell.source  | markdown2html | strip_files_prefix }}
 </div>
 </div>
 </div>
 {%- endblock markdowncell %}
 
 {% block headingcell scoped %}
 <div class="cell border-box-sizing text_cell rendered">
 {{ self.empty_in_prompt() }}
 <div class="inner_cell">
 <div class="text_cell_render border-box-sizing rendered_html">
 {{ ("#" * cell.level + cell.source) | replace('\n', ' ')  | markdown2html | strip_files_prefix | add_anchor }}
 </div>
 </div>
 </div>
 {% endblock headingcell %}
 
 {% block unknowncell scoped %}
 unknown type  {{ cell.type }}
 {% endblock unknowncell %}
 
 {% block pyout -%}
 {%- set extra_class="output_pyout" -%}
 {% block data_priority scoped %}
 {{ super() }}
 {% endblock %}
 {%- set extra_class="" -%}
 {%- endblock pyout %}
 
 {% block stream_stdout -%}
 <div class="output_subarea output_stream output_stdout output_text">
 <pre>
 {{ output.text | ansi2html }}
 </pre>
 </div>
 {%- endblock stream_stdout %}
 
 {% block stream_stderr -%}
 <div class="output_subarea output_stream output_stderr output_text">
 <pre>
 {{ output.text | ansi2html }}
 </pre>
 </div>
 {%- endblock stream_stderr %}
 
 {% block data_svg scoped -%}
 <div class="output_svg output_subarea {{extra_class}}">
 {%- if output.svg_filename %}
 <img src="{{output.svg_filename | posix_path}}"
 {%- else %}
 {{ output.svg }}
 {%- endif %}
 </div>
 {%- endblock data_svg %}
 
 {% block data_html scoped -%}
 <div class="output_html rendered_html output_subarea {{extra_class}}">
 {{ output.html }}
 </div>
 {%- endblock data_html %}
 
 {% block data_png scoped %}
 <div class="output_png output_subarea {{extra_class}}">
 {%- if output.png_filename %}
 <img src="{{output.png_filename | posix_path}}"
 {%- else %}
 <img src="data:image/png;base64,{{ output.png }}"
 {%- endif %}
 {%- if 'metadata' in output and 'width' in output.metadata.get('png', {}) %}
 width={{output.metadata['png']['width']}}
 {%- endif %}
 {%- if 'metadata' in output and 'height' in output.metadata.get('png', {}) %}
 height={{output.metadata['png']['height']}}
 {%- endif %}
 >
 </div>
 {%- endblock data_png %}
 
 {% block data_jpg scoped %}
 <div class="output_jpeg output_subarea {{extra_class}}">
 {%- if output.jpeg_filename %}
 <img src="{{output.jpeg_filename | posix_path}}"
 {%- else %}
 <img src="data:image/jpeg;base64,{{ output.jpeg }}"
 {%- endif %}
 {%- if 'metadata' in output and 'width' in output.metadata.get('jpeg', {}) %}
 width={{output.metadata['jpeg']['width']}}
 {%- endif %}
 {%- if 'metadata' in output and 'height' in output.metadata.get('jpeg', {}) %}
 height={{output.metadata['jpeg']['height']}}
 {%- endif %}
 >
 </div>
 {%- endblock data_jpg %}
 
 {% block data_latex scoped %}
 <div class="output_latex output_subarea {{extra_class}}">
 {{ output.latex }}
 </div>
 {%- endblock data_latex %}
 
 {% block pyerr -%}
 <div class="output_subarea output_text output_pyerr">
 <pre>{{ super() }}</pre>
 </div>
 {%- endblock pyerr %}
 
 {%- block traceback_line %}
 {{ line | ansi2html }}
 {%- endblock traceback_line %}
 
 {%- block data_text scoped %}
 <div class="output_text output_subarea {{extra_class}}">
 <pre>
 {{ output.text | ansi2html }}
 </pre>
 </div>
 {%- endblock -%}
 
 {%- block data_javascript scoped %}
 <div class="output_subarea output_javascript {{extra_class}}">
 <script type="text/javascript">
 {{ output.javascript }}
 </script>
 </div>
 {%- endblock -%}

IPython/nbconvert/templates/latex/style_bw_ipython.tplx

@@ -1,41 +1,45 b''
 ((= Black&white ipython input/output style =))
 
 ((*- extends 'base.tplx' -*))
 
 %===============================================================================
 % Input
 %===============================================================================
 
 ((* block input scoped *))
 ((( add_prompt(cell.input, cell, 'In ') )))
 ((* endblock input *))
 
 
 %===============================================================================
 % Output
 %===============================================================================
 
 ((* block pyout scoped *))
     ((*- for type in output | filter_data_type -*))
         ((*- if type in ['text']*))
 ((( add_prompt(output.text, cell, 'Out') )))
         ((*- else -*))
 \verb+Out[((( cell.prompt_number )))]:+((( super() )))
         ((*- endif -*))
     ((*- endfor -*))
 ((* endblock pyout *))
 
 
 %==============================================================================
 % Support Macros
 %==============================================================================
 
 % Name: draw_prompt
 % Purpose: Renders an output/input prompt
 ((* macro add_prompt(text, cell, prompt) -*))
-    ((*- set prompt_number = "" ~ cell.prompt_number -*))
+    ((*- if cell.prompt_number is defined -*))
+    ((*- set prompt_number = "" ~ (cell.prompt_number | replace(None, " ")) -*))
+    ((*- else -*))
+    ((*- set prompt_number = " " -*))
+    ((*- endif -*))
     ((*- set indentation = " " * (prompt_number | length + 7) -*))
 \begin{verbatim}
 (((- text | add_prompts(first=prompt ~ '[' ~ prompt_number ~ ']: ', cont=indentation) -)))
 \end{verbatim}
 ((*- endmacro *))

IPython/nbconvert/templates/latex/style_ipython.tplx

@@ -1,54 +1,58 b''
 ((= IPython input/output style =))
 
 ((*- extends 'base.tplx' -*))
 
 % Custom definitions
 ((* block definitions *))
     ((( super() )))
 
     % Pygments definitions
     ((( resources.latex.pygments_definitions )))
 
     % Exact colors from NB
     \definecolor{incolor}{rgb}{0.0, 0.0, 0.5}
     \definecolor{outcolor}{rgb}{0.545, 0.0, 0.0}
 
 ((* endblock definitions *))
 
 %===============================================================================
 % Input
 %===============================================================================
 
 ((* block input scoped *))
     ((( add_prompt(cell.input | highlight2latex(strip_verbatim=True), cell, 'In ', 'incolor') )))
 ((* endblock input *))
 
 
 %===============================================================================
 % Output
 %===============================================================================
 
 ((* block pyout scoped *))
     ((*- for type in output | filter_data_type -*))
         ((*- if type in ['text']*))
             ((( add_prompt(output.text | escape_latex, cell, 'Out', 'outcolor') )))
         ((* else -*))
 \texttt{\color{outcolor}Out[{\color{outcolor}((( cell.prompt_number )))}]:}((( super() )))
         ((*- endif -*))
     ((*- endfor -*))
 ((* endblock pyout *))
 
 
 %==============================================================================
 % Support Macros
 %==============================================================================
 
 % Name: draw_prompt
 % Purpose: Renders an output/input prompt
 ((* macro add_prompt(text, cell, prompt, prompt_color) -*))
-    ((*- set prompt_number = "" ~ cell.prompt_number -*))
+    ((*- if cell.prompt_number is defined -*))
+    ((*- set prompt_number = "" ~ (cell.prompt_number | replace(None, " ")) -*))
+    ((*- else -*))
+    ((*- set prompt_number = " " -*))
+    ((*- endif -*))
     ((*- set indention =  " " * (prompt_number | length + 7) -*))
 \begin{Verbatim}[commandchars=\\\{\}]
 ((( text | add_prompts(first='{\color{' ~ prompt_color ~ '}' ~ prompt ~ '[{\\color{' ~ prompt_color ~ '}' ~ prompt_number ~ '}]:} ', cont=indention) )))
 \end{Verbatim}
 ((*- endmacro *))