Prepare datasets consistently (#228)

Author: dmcg

04_dataframe.ipynb

@@ -56,6 +56,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "%run prep.py -d accounts\n",
     "%run prep.py -d flights"
    ]
   },
@@ -81,7 +82,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "We create artificial data."
+    "We load the accounts data."
    ]
   },
   {
@@ -90,9 +91,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from prep import accounts_csvs\n",
-    "accounts_csvs()\n",
-    "\n",
     "import os\n",
     "import dask\n",
     "filename = os.path.join('data', 'accounts.*.csv')\n",