Notebook example cleanup

Author: lukelbd

docs/2dplots.ipynb

@@ -71,8 +71,10 @@
     "\n",
     "# DataFrame\n",
     "data = state.rand(20, 20)\n",
-    "df = pd.DataFrame(data.cumsum(axis=0).cumsum(\n",
-    "    axis=1), index=[*'JFMAMJJASONDJFMAMJJA'])\n",
+    "df = pd.DataFrame(\n",
+    "    data.cumsum(axis=0).cumsum(axis=1),\n",
+    "    index=[*'JFMAMJJASONDJFMAMJJA']\n",
+    ")\n",
     "df.name = 'temporal data'\n",
     "df.index.name = 'index'\n",
     "df.columns.name = 'time (days)'"