examples.ipynb

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    "# Examples for lolviz\n",
    "\n",
    "## Install\n",
    "If on mac, I had to do this:\n",
    "\n",
    "```bash\n",
    "$ brew install graphviz  # had to upgrade graphviz on el capitan\n",
    "```\n",
    "\n",
    "Then\n",
    "\n",
    "```bash\n",
    "$ pip install lolviz\n",
    "```"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Sample visualizations"
   ]
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  {
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   "execution_count": 1,
   "metadata": {
    "collapsed": true
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   "outputs": [],
   "source": [
    "from lolviz import objviz, listviz, lolviz, callviz, callsviz, treeviz, strviz"
   ]
  },
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    "table = [\n",
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    "objviz(table)"
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     "execution_count": 9,
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   "source": [
    "# test linked list node\n",
    "class Node:\n",
    "    def __init__(self, value, next=None):\n",
    "        self.value = value\n",
    "        self.next = next\n",
    "\n",
    "head = Node('tombu')\n",
    "head = Node('parrt', head)\n",
    "head = Node(\"xue\", head)\n",
    "objviz(head)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
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    "a = {Node('parrt'),Node('mary')}\n",
    "objviz(a)"
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    "data = [[]] * 5  # INCORRECT list of list init\n",
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    "key = 'a'\n",
    "value = 99\n",
    "def hashcode(o): return ord(o) # assume keys are single-element strings\n",
    "print \"hashcode =\", hashcode(key)\n",
    "bucket_index = hashcode(key) % len(table)\n",
    "print \"bucket_index =\", bucket_index\n",
    "bucket = table[bucket_index]\n",
    "bucket.append( (key,value) ) # add association to the bucket\n",
    "lolviz(table)"
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      "hashcode = 102\n",
      "bucket_index = 2\n"
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    "key = 'f'\n",
    "value = 99\n",
    "print \"hashcode =\", hashcode(key)\n",
    "bucket_index = hashcode(key) % len(table)\n",
    "print \"bucket_index =\", bucket_index\n",
    "bucket = table[bucket_index]\n",
    "bucket.append( (key,value) ) # add association to the bucket\n",
    "lolviz(table)"
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    "If we don't indicate we want a simple 2-level list of list with `lolviz()`, we get a generic object graph:"
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    "mycourses = courses\n",
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    "class Tree:\n",
    "    def __init__(self, value, left=None, right=None):\n",
    "        self.value = value\n",
    "        self.left = left\n",
    "        self.right = right\n",
    "        \n",
    "root = Tree('parrt',\n",
    "            Tree('mary',\n",
    "                 Tree('jim',\n",
    "                      Tree('srinivasan'),\n",
    "                      Tree('april'))),\n",
    "            Tree('xue',None,Tree('mike')))\n",
    "\n",
    "treeviz(root)"
   ]
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   "source": [
    "from IPython.display import display\n",
    "\n",
    "N = 100\n",
    "\n",
    "def f(x):\n",
    "    a = ['hi','mom']\n",
    "    thestack = callsviz(varnames=['table','x','head','courses','N','a'])\n",
    "    display(thestack)\n",
    "    \n",
    "f(99)"
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    "If you'd like to save an image from jupyter, use `render()`:"
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  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {},
   "outputs": [
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     "name": "stdout",
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     "text": [
      "\n",
      "    digraph G {\n",
      "        nodesep=.1;\n",
      "        ranksep=.1;\n",
      "        rankdir=LR;\n",
      "        node [penwidth=\n"
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    "def f(x):\n",
    "    thestack = callsviz(varnames=['table','x','tree','head','courses'])\n",
    "    print thestack.source[:100]  # show first 100 char of graphviz syntax\n",
    "    thestack.render(\"/tmp/t\") # save as PDF\n",
    "    \n",
    "f(99)"
   ]
  }
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