IErlang Notebook - April 15, 2014

IErlang

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   "cells": [
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     "cell_type": "markdown",
     "metadata": {
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       "slide_type": "slide"
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     "source": [
      "<img src=\"http://i.imgur.com/7rr6Tbr.png\" title=\"Hosted by imgur.com\"/>\n",
      "\n",
      "##April 20, 2014\n",
      ">Developed by [Robbie Lynch](http://roblynch.info)\n",
      "\n",
      ">Supervised by [Paul Barry](http://glasnost.itcarlow.ie/~barryp/)\n",
      "\n",
      ">Institute of Technology, Carlow, Ireland.\n",
      "\n",
      "----\n",
      "\n",
      "##Download\n",
      "Download the IErlang Kernel for IPython at http://github.com/robbielynch/ierlang\n",
      "\n",
      "---"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {
      "slideshow": {
       "slide_type": "slide"
      }
     },
     "source": [
      "#Data Types"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "AnInt = 1234."
     ],
     "language": "python",
     "metadata": {
      "slideshow": {
       "slide_type": "fragment"
      }
     },
     "outputs": [
      {
       "html": [
        "<pre>1234</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 1,
       "text": [
        "1234"
       ]
      }
     ],
     "prompt_number": 1
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "AFloat = 55 / 3."
     ],
     "language": "python",
     "metadata": {
      "slideshow": {
       "slide_type": "fragment"
      }
     },
     "outputs": [
      {
       "html": [
        "<pre>18.333333333333332</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 2,
       "text": [
        "18.333333333333332"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "AString = \"Awesome!\"."
     ],
     "language": "python",
     "metadata": {
      "slideshow": {
       "slide_type": "fragment"
      }
     },
     "outputs": [
      {
       "html": [
        "<pre>\"Awesome!\"</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 3,
       "text": [
        "\"Awesome!\""
       ]
      }
     ],
     "prompt_number": 3
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "AnAtom = 'This is an atom with spaces'."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>'This is an atom with spaces'</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 4,
       "text": [
        "'This is an atom with spaces'"
       ]
      }
     ],
     "prompt_number": 4
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "atom_with_no_spaces."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>atom_with_no_spaces</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 5,
       "text": [
        "atom_with_no_spaces"
       ]
      }
     ],
     "prompt_number": 5
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "{this, is, a, tuple_of_atoms}."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>{this,is,a,tuple_of_atoms}</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 6,
       "text": [
        "{this,is,a,tuple_of_atoms}"
       ]
      }
     ],
     "prompt_number": 6
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "AList = [1,2,3,4,5]."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>[1,2,3,4,5]</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 7,
       "text": [
        "[1,2,3,4,5]"
       ]
      }
     ],
     "prompt_number": 7
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "#Variable Bindings\n",
      "i.e. Referring to previously assigned variables."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "AVariable = 100."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>100</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 8,
       "text": [
        "100"
       ]
      }
     ],
     "prompt_number": 8
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "AnotherVar = 77."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>77</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 9,
       "text": [
        "77"
       ]
      }
     ],
     "prompt_number": 9
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "AVariable + AnotherVar."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>177</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 10,
       "text": [
        "177"
       ]
      }
     ],
     "prompt_number": 10
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "NedStark = [[]|[AnotherVar + AVariable]]."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>[[],177]</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 11,
       "text": [
        "[[],177]"
       ]
      }
     ],
     "prompt_number": 11
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "NedStark."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>[[],177]</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 12,
       "text": [
        "[[],177]"
       ]
      }
     ],
     "prompt_number": 12
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "#Built in Functions"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "lists:sort([10,9,8,3,5,4,6,1,7,2])."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>[1,2,3,4,5,6,7,8,9,10]</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 13,
       "text": [
        "[1,2,3,4,5,6,7,8,9,10]"
       ]
      }
     ],
     "prompt_number": 13
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "io:format(\"hello\")."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>ok</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 14,
       "text": [
        "ok"
       ]
      }
     ],
     "prompt_number": 14
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "is_integer(4325345)."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>true</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 15,
       "text": [
        "true"
       ]
      }
     ],
     "prompt_number": 15
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "os:cmd(\"pwd\")."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>\"/home/robbie/dev/ierlang/src<br />\"</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 16,
       "text": [
        "\"/home/robbie/dev/ierlang/src\\n\""
       ]
      }
     ],
     "prompt_number": 16
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "is_binary(<<\"Hello\">>)."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>true</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 17,
       "text": [
        "true"
       ]
      }
     ],
     "prompt_number": 17
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "#Expressions"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "9283479238472398472398472394872398 * 28347632847623847623847623847623847623847632874623864."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>263164661000754185502995313263072243291280523500406936157710040110469708162166525705872</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 18,
       "text": [
        "263164661000754185502995313263072243291280523500406936157710040110469708162166525705872"
       ]
      }
     ],
     "prompt_number": 18
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "99 div 5. %%Integer division"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>19</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 19,
       "text": [
        "19"
       ]
      }
     ],
     "prompt_number": 19
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "99 / 5."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>19.8</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 20,
       "text": [
        "19.8"
       ]
      }
     ],
     "prompt_number": 20
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "893475 - 98234798432579348753."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>-98234798432578455278</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 21,
       "text": [
        "-98234798432578455278"
       ]
      }
     ],
     "prompt_number": 21
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "#Errors"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "this will throw an error"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>{badmatch,{error,{1,erl_parse,[\"syntax error before: \",\"will\"]}}}</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 22,
       "text": [
        "{badmatch,{error,{1,erl_parse,[\"syntax error before: \",\"will\"]}}}"
       ]
      }
     ],
     "prompt_number": 22
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "lists:flatten(notalist)."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>function_clause</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 23,
       "text": [
        "function_clause"
       ]
      }
     ],
     "prompt_number": 23
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "55 div 44.3."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>badarith</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 24,
       "text": [
        "badarith"
       ]
      }
     ],
     "prompt_number": 24
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "#Terminal Commands\n",
      "To make interacion with the terminal quicker and easier, you can run terminal commands\n",
      "\n",
      "by pre-pending `;;` before the command. For example:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      ";;pwd"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>\"/home/robbie/dev/ierlang/src<br />\"</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 25,
       "text": [
        "\"/home/robbie/dev/ierlang/src\\n\""
       ]
      }
     ],
     "prompt_number": 25
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      ";;date"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>\"Sun Apr 20 16:56:04 BST 2014<br />\"</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 26,
       "text": [
        "\"Sun Apr 20 16:56:04 BST 2014\\n\""
       ]
      }
     ],
     "prompt_number": 26
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      ";;whereis ipython"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>\"ipython: /usr/bin/ipython2.7 /usr/bin/X11/ipython2.7 /usr/local/bin/ipython /usr/share/man/man1/ipython.1.gz<br />\"</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 27,
       "text": [
        "\"ipython: /usr/bin/ipython2.7 /usr/bin/X11/ipython2.7 /usr/local/bin/ipython /usr/share/man/man1/ipython.1.gz\\n\""
       ]
      }
     ],
     "prompt_number": 27
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      ";;ping -c 5 google.com"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>\"PING google.com (74.125.24.101) 56(84) bytes of data.<br />64 bytes from de-in-f101.1e100.net (74.125.24.101): icmp_req=1 ttl=44 time=60.0 ms<br />64 bytes from de-in-f101.1e100.net (74.125.24.101): icmp_req=2 ttl=44 time=68.5 ms<br />64 bytes from de-in-f101.1e100.net (74.125.24.101): icmp_req=3 ttl=44 time=47.4 ms<br />64 bytes from de-in-f101.1e100.net (74.125.24.101): icmp_req=4 ttl=44 time=67.1 ms<br />64 bytes from de-in-f101.1e100.net (74.125.24.101): icmp_req=5 ttl=44 time=45.8 ms<br /><br />--- google.com ping statistics ---<br />5 packets transmitted, 5 received, 0% packet loss, time 4004ms<br />rtt min/avg/max/mdev = 45.816/57.810/68.506/9.563 ms<br />\"</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 28,
       "text": [
        "\"PING google.com (74.125.24.101) 56(84) bytes of data.\\n64 bytes from de-in-f101.1e100.net (74.125.24.101): icmp_req=1 ttl=44 time=60.0 ms\\n64 bytes from de-in-f101.1e100.net (74.125.24.101): icmp_req=2 ttl=44 time=68.5 ms\\n64 bytes from de-in-f101.1e100.net (74.125.24.101): icmp_req=3 ttl=44 time=47.4 ms\\n64 bytes from de-in-f101.1e100.net (74.125.24.101): icmp_req=4 ttl=44 time=67.1 ms\\n64 bytes from de-in-f101.1e100.net (74.125.24.101): icmp_req=5 ttl=44 time=45.8 ms\\n\\n--- google.com ping statistics ---\\n5 packets transmitted, 5 received, 0% packet loss, time 4004ms\\nrtt min/avg/max/mdev = 45.816/57.810/68.506/9.563 ms\\n\""
       ]
      }
     ],
     "prompt_number": 28
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      ";;ls mochi*"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>\"mochijson2.beam<br />mochijson2.erl<br />mochinum.beam<br />mochinum.erl<br />\"</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 29,
       "text": [
        "\"mochijson2.beam\\nmochijson2.erl\\nmochinum.beam\\nmochinum.erl\\n\""
       ]
      }
     ],
     "prompt_number": 29
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "##We can even compile erlang via the terminal commands"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      ";;erlc mochijson2.erl"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>[]</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 30,
       "text": [
        "[]"
       ]
      }
     ],
     "prompt_number": 30
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      ">It's possible to start the original IPython Notebook with the command \n",
      "```\n",
      ";;ipython notebook\n",
      "```\n",
      "Although, it does kill our kernel :("
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "#Modules"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "###We can create, save and compile erlang modules\n",
      ">And if we deliberatly leave an error on line 4... it will tell us...."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "-module(super_awesome_module). %%First line must begin with -module().\n",
      "-export([my_favorite_numbers/0, unlucky_number/0]).\n",
      "\n",
      "my_favorite_numbers()- %%<---------------------This is where the error is%%\n",
      "[1, 2, 3, 4, 5].\n",
      "\n",
      "unlucky_number()->\n",
      "((278346287 * 98324928374) - (829437 * 3476) - (27368378729560724309 + (2 * 2)))."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>super_awesome_module.erl:4: syntax error before: '-'<br />super_awesome_module.erl:2: function my_favorite_numbers/0 undefined<br /></pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 31,
       "text": [
        "super_awesome_module.erl:4: syntax error before: '-'\n",
        "super_awesome_module.erl:2: function my_favorite_numbers/0 undefined\n"
       ]
      }
     ],
     "prompt_number": 31
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      ">It also tells us when things work..."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "-module(super_awesome_module). %%First line must begin with -module().\n",
      "-export([my_favorite_numbers/0, unlucky_number/0]).\n",
      "\n",
      "my_favorite_numbers()->\n",
      "[1, 2, 3, 4, 5].\n",
      "\n",
      "unlucky_number()->\n",
      "((278346287 * 98324928374) - (829437 * 3476) - (27368378729560724309 + (2 * 2)))."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>Successfully Compiled</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 32,
       "text": [
        "Successfully Compiled"
       ]
      }
     ],
     "prompt_number": 32
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "###Now for the cool part\n",
      ">We can reference the exported functions from our compiled modules"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "super_awesome_module:my_favorite_numbers()."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>[1,2,3,4,5]</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 33,
       "text": [
        "[1,2,3,4,5]"
       ]
      }
     ],
     "prompt_number": 33
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "lists:reverse(super_awesome_module:my_favorite_numbers())."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>[5,4,3,2,1]</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 34,
       "text": [
        "[5,4,3,2,1]"
       ]
      }
     ],
     "prompt_number": 34
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "super_awesome_module:unlucky_number()."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre>13</pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 35,
       "text": [
        "13"
       ]
      }
     ],
     "prompt_number": 35
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "MyPid = spawn(super_awesome_module, unlucky_number, [])."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre><0.49.0></pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 36,
       "text": [
        "<0.49.0>"
       ]
      }
     ],
     "prompt_number": 36
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "MyPid."
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<pre><0.49.0></pre>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 37,
       "text": [
        "<0.49.0>"
       ]
      }
     ],
     "prompt_number": 37
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "#Some Problems\n",
      "####as of April 16, 2014"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "* Encoding tuples inside other data structures\n",
      "* ~~Encoding floats inside other data structures~~\n",
      "* ~~**ERROR MESSAGES** - They do not appear (Something to do with pyerr on ierlang side)~~\n",
      "* Cannot create notebooks outside ierlang/src directory\n",
      "* Horrible installation and setup\n",
      "* Having to edit the IPython code in order to parse erlang strings (lists of ints)\n",
      "    * Note that the editing of the IPython code does not affect the normal IPython in any way.\n",
      "* ~~**No Variable bindings** (yet)~~\n",
      "* ~~Tuples are converted to lists when encoding~~\n",
      "* Project structure - it's a mess\n",
      "* Not handling all of IPython's messages (yet)"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "#Thanks for the help"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "* [Paul Barry](http://glasnost.itcarlow.ie/~barryp/) - Supervisor/Mastermind\n",
      "* [Andrew Gibiansky](http://andrew.gibiansky.com/) - IHaskell Creator\n",
      "* [Roberto Aloi](http://roberto-aloi.com/) - Erlang Sandbox Creator"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "#Find me on Twitter"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "##[@LynchRobbie](http://twitter.com/lynchrobbie)"
     ]
    }
   ],
   "metadata": {}
  }
 ]
}