update ipympl in other libraries section

Author: ianhi

notebooks/07.More-libraries/07.05-other-widget-libraries.ipynb

@@ -276,7 +276,7 @@
    "source": [
     "# ipympl: The Matplotlib Jupyter Widget Backend\n",
     "\n",
-    "## https://github.com/matplotlib/ipympl\n",
+    "## https://matplotlib.org/ipympl/\n",
     "\n",
     "\n",
     "Enabling interaction with matplotlib charts in the Jupyter notebook and JupyterLab\n",
@@ -295,7 +295,7 @@
    "id": "91a33e30-803d-4945-8129-2c37f30a1d09",
    "metadata": {},
    "source": [
-    "Enabling the `widget` backend. This requires ipympl. ipympl can be install via pip or conda."
+    "Enabling the `ipympl` (sometimes written `widget`) backend. ipympl can be install via pip or conda."
    ]
   },
   {
@@ -305,7 +305,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "%matplotlib widget"
+    "%matplotlib ipympl"
    ]
   },
   {
@@ -334,32 +334,30 @@
    "cell_type": "code",
    "execution_count": null,
    "id": "9db5b3e0-317c-4b79-bb5c-36786d02895a",
-   "metadata": {},
+   "metadata": {
+    "tags": []
+   },
    "outputs": [],
    "source": [
-    "plt.ioff()\n",
-    "plt.clf()\n",
-    "\n",
-    "slider = FloatSlider(\n",
-    "    value=1.0,\n",
-    "    min=0.02,\n",
-    "    max=2.0\n",
-    ")\n",
-    "\n",
-    "fig1 = plt.figure(1)\n",
+    "with plt.ioff():\n",
+    "    fig, ax = plt.subplots()\n",
     "\n",
     "x1 = np.linspace(0, 20, 500)\n",
     "\n",
     "lines = plt.plot(x1, np.sin(slider.value  * x1))\n",
     "\n",
     "def update_lines(change):\n",
     "    lines[0].set_data(x1, np.sin(change.new * x1))\n",
-    "    fig1.canvas.draw()\n",
-    "    fig1.canvas.flush_events()\n",
+    "    fig.canvas.draw()\n",
     "\n",
+    "slider = FloatSlider(\n",
+    "    value=1.0,\n",
+    "    min=0.02,\n",
+    "    max=2.0\n",
+    ")\n",
     "slider.observe(update_lines, names='value')\n",
     "\n",
-    "VBox([slider, fig1.canvas])"
+    "VBox([slider, fig.canvas])"
    ]
   },
   {
@@ -451,6 +449,13 @@
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
    "version": "3.9.13"
+  },
+  "widgets": {
+   "application/vnd.jupyter.widget-state+json": {
+    "state": {},
+    "version_major": 2,
+    "version_minor": 0
+   }
   }
  },
  "nbformat": 4,