update user guide

Author: attack68

doc/source/user_guide/style.ipynb

@@ -49,6 +49,7 @@
    "source": [
     "import pandas as pd\n",
     "import numpy as np\n",
+    "import matplotlib as mpl\n",
     "\n",
     "df = pd.DataFrame([[38.0, 2.0, 18.0, 22.0, 21, np.nan],[19, 439, 6, 452, 226,232]], \n",
     "                  index=pd.Index(['Tumour (Positive)', 'Non-Tumour (Negative)'], name='Actual Label:'), \n",
@@ -1275,9 +1276,9 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Additional keyword arguments give more control on centering and positioning, and you can pass a list of `[color_negative, color_positive]` to highlight lower and higher values.\n",
+    "Additional keyword arguments give more control on centering and positioning, and you can pass a list of `[color_negative, color_positive]` to highlight lower and higher values or a matplotlib colormap.\n",
     "\n",
-    "Here's how you can change the above with the new `align` option, combined with setting `vmin` and `vmax` limits, the `width` of the figure, and underlying css `props` of cells, leaving space to display the text and the bars:"
+    "To showcase an example here's how you can change the above with the new `align` option, combined with setting `vmin` and `vmax` limits, the `width` of the figure, and underlying css `props` of cells, leaving space to display the text and the bars. We also use `text_gradient` to color the text the same as the bars using a matplotlib colormap (although in this case the visualization is probably better without this additional effect)."
    ]
   },
   {
@@ -1286,8 +1287,10 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "df2.style.bar(align=0, vmin=-2.5, vmax=2.5, color=['#d65f5f', '#5fba7d'], height=50,\n",
-    "              width=60, props=\"width: 120px; border-right: 1px solid black;\").format('{:.3f}', na_rep=\"\")"
+    "df2.style.format('{:.3f}', na_rep=\"\")\\\n",
+    "         .bar(align=0, vmin=-2.5, vmax=2.5, color=mpl.cm.get_cmap(\"bwr\"), height=50,\n",
+    "              width=60, props=\"width: 120px; border-right: 1px solid black;\")\\\n",
+    "         .text_gradient(cmap=\"bwr\", vmin=-2.5, vmax=2.5)"
    ]
   },
   {
@@ -2031,7 +2034,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.7"
+   "version": "3.8.6"
   }
  },
  "nbformat": 4,