Update Pandas_walkthrough.ipynb

Author: marcoalopez

notebooks/Pandas_walkthrough.ipynb

@@ -1996,7 +1996,7 @@
    "metadata": {},
    "source": [
     "\n",
-    "# Using the ``.groupby()`` method\n",
+    "# Using the ``.groupby()`` and ``.melt()`` methods\n",
     "\n",
     "TODO\n",
     "\n",
@@ -2019,7 +2019,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Notebook tested in 2025-06-18 using:\n",
+      "Notebook tested in 2025-07-15 using:\n",
       "Python 3.13.5 | packaged by conda-forge | (main, Jun 16 2025, 08:20:19) [MSC v.1943 64 bit (AMD64)]\n",
       "Pandas 2.3.0\n"
      ]