{
    "worksheets": [
        {
            "cells": [
                {
                    "source": "A demonstration of the ability to clear the output of a cell during execution.", 
                    "cell_type": "markdown"
                }, 
                {
                    "cell_type": "code", 
                    "language": "python", 
                    "outputs": [], 
                    "collapsed": true, 
                    "prompt_number": 8, 
                    "input": "from IPython.core.display import clear_output, display"
                }, 
                {
                    "cell_type": "code", 
                    "language": "python", 
                    "outputs": [], 
                    "collapsed": false, 
                    "prompt_number": 4, 
                    "input": "import time"
                }, 
                {
                    "source": "First we show how this works with ``display``:", 
                    "cell_type": "markdown"
                }, 
                {
                    "cell_type": "code", 
                    "language": "python", 
                    "outputs": [], 
                    "collapsed": false, 
                    "prompt_number": 17, 
                    "input": "for i in range(10):\n    display(\"Time step: %i\" % i)\n    time.sleep(0.5)\n    clear_output()"
                }, 
                {
                    "source": "Next, we show that ``clear_output`` can also be used to create a primitive form of animation using\nmatplotlib:", 
                    "cell_type": "markdown"
                }, 
                {
                    "cell_type": "code", 
                    "language": "python", 
                    "outputs": [], 
                    "collapsed": false, 
                    "prompt_number": 20, 
                    "input": "for i in range(10):\n    figure()\n    plot(rand(100))\n    show()\n    time.sleep(0.1)\n    clear_output()"
                }
            ]
        }
    ], 
    "metadata": {
        "name": "clear_output"
    }, 
    "nbformat": 2
}