fix the strange attractors app (#457)

attractors/anaconda-project.yml

@@ -38,12 +38,15 @@ dependencies: *pkgs
 
 commands:
   dashboard:
-    unix: panel serve --rest-session-info --session-history -1 *_panel.ipynb --show
+    unix: panel serve --rest-session-info --session-history -1 attractors_panel.ipynb clifford_panel.ipynb --show
     supports_http_options: true
   notebook:
     notebook: index.ipynb
 
-variables: {}
+variables:
+  # Avoid "Dask dataframe query planning is disabled because dask-expr is not installed."
+  DASK_DATAFRAME__QUERY_PLANNING: "False"
+
 downloads: {}
 
 platforms:

attractors/attractors.py

@@ -274,7 +274,7 @@ def _save(self):
         if self.output_examples_filename == self.param.input_examples_filename.default:
             raise FileExistsError('Cannot override the default attractors file.')
         with open(Path('data', self.output_examples_filename), "w") as f:
-            yaml.dump(self.param.example.objects,f)
+            yaml.dump(list(self.param.example.objects), f)
 
     def __call__(self):
         return self.example

attractors/attractors_panel.ipynb

@@ -162,6 +162,7 @@
    "source": [
     "import param, panel as pn\n",
     "from panel.pane import LaTeX\n",
+    "\n",
     "pn.extension('katex', sizing_mode='stretch_width')\n",
     "\n",
     "pn.Param.margin = 0\n",
@@ -170,7 +171,7 @@
     "class Attractors(pn.viewable.Viewer):\n",
     "    attractor_type = param.Selector(objects=params.attractors, default=params.attractors[\"Clifford\"], precedence=0.9)\n",
     "\n",
-    "    parameters = param.Selector(objects=params.attractors, precedence=-0.5, readonly=True)\n",
+    "    parameters = param.Parameter(params, precedence=-0.5, readonly=True)\n",
     "\n",
     "    plot_type = param.Selector(\n",
     "        precedence=0.8, objects=['points', 'line'],\n",
@@ -182,7 +183,7 @@
     "\n",
     "    @param.depends(\"parameters.param\", watch=True)\n",
     "    def _update_from_parameters(self):\n",
-    "        a = params.attractor(*self.attractor_type())\n",
+    "        a = params.attractor(*self.parameters())\n",
     "        if a is not self.attractor_type:\n",
     "            self.param.update(attractor_type=a)\n",
     "\n",
@@ -200,7 +201,7 @@
     "\n",
     "ats = Attractors(name=\"Options\")\n",
     "params.current = lambda: ats.attractor_type\n",
-    "ats # Uncomment to see a plot of the current attractor"
+    "# ats # Uncomment to see a plot of the current attractor"
    ]
   },
   {
@@ -257,6 +258,15 @@
     "Ok, now we are ready to put everything together into a dashboard using one of the available panel templates, which we will mark `.servable()` to indicate that the dashboard should be displayed if this notebook is run using `panel serve`:"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "pn.Row(plot, widgets)"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,