automatically set plotly renderers

assignments.md

@@ -100,14 +100,7 @@ Note: In-class exercises will not be graded.
   - [How to read a JSON file](https://www.freecodecamp.org/news/python-parse-json-how-to-read-a-json-file/#how-to-parse-and-read-a-json-file-in-python)
 {% else -%}
 - **PDF export:**
-
-  - **Plotly charts/maps not appearing:** Include the [boilerplate](https://whynameitthat.blogspot.com/2013/10/boiler-plate.html) code.
-
-    ```python
-    import plotly.io as pio
-    pio.renderers.default = "notebook_connected+pdf"
-    ```
-
+  - **Plotly charts/maps not appearing:** Make sure you've done the [one-time setup](lecture_0.ipynb#id2).
   - **500 error:** You may be outputting too much data. Try reducing your output (in the Jupyter sense) to smaller subsets.
 {% endif -%}
 - **When using `choropleth_mapbox()`, nothing appears on the map:** Make sure:

lecture_0.ipynb

@@ -593,22 +593,30 @@
     "1. Create a notebook{% if id == 'nyu' %}\n",
     "   1. Click `New`\n",
     "   1. Under `Notebook`, click `Python [conda env:python-public-policy]`\n",
-    "{% endif -%}\n",
-    "1. Paste in [the following example](https://plotly.com/python/linear-fits/#linear-fit-trendlines-with-plotly-express)\n",
-    "1. Press the ▶️ button (or `Control`+`Enter` on your keyboard)\n",
+    "1. Do some one-time setup, coping in the following code: <!-- https://stackoverflow.com/a/47051758/358804 -->\n",
     "\n",
-    "```python\n",
-    "{% if id == 'nyu' -%}\n",
-    "import plotly.io as pio\n",
-    "pio.renderers.default = \"notebook_connected+pdf\"\n",
+    "    ```python\n",
+    "    from pathlib import Path\n",
     "\n",
-    "{% endif -%}\n",
-    "import plotly.express as px\n",
+    "    dest = Path(get_ipython().profile_dir.startup_dir) / \"plotly_renderer.py\"\n",
+    "\n",
+    "    print(dest)\n",
+    "\n",
+    "    code = \"\"\"\n",
+    "    import plotly.io as pio\n",
     "\n",
-    "df = px.data.tips()\n",
-    "fig = px.scatter(df, x=\"total_bill\", y=\"tip\", trendline=\"ols\")\n",
-    "fig.show()\n",
-    "```  "
+    "    pio.renderers.default = \"notebook_connected+pdf\"\n",
+    "    \"\"\"\n",
+    "\n",
+    "    with open(dest, \"w\") as f:\n",
+    "        f.write(code)\n",
+    "\n",
+    "    print(\"Plotly has been set up\")\n",
+    "    ```\n",
+    "\n",
+    "{% endif -%}\n",
+    "1. Paste in [this example](https://plotly.com/python/linear-fits/#linear-fit-trendlines-with-plotly-express)\n",
+    "1. Press the ▶️ button (or `Control`+`Enter` on your keyboard)"
    ]
   },
   {