Update density_and_public_transportation.ipynb

Author: davidbailey

docs/notebooks/density_and_public_transportation.ipynb

@@ -644,7 +644,6 @@
    "outputs": [],
    "source": [
     "from mapclassify import Quantiles\n",
-    "import numpy\n",
     "\n",
     "zones_interpolated[\"Accessibility w/in 15 minutes\"] = tdf.T.sum()\n",
     "layer = SolidPolygonLayer.from_geopandas(zones_interpolated, opacity=0.1)\n",