diff --git a/module3/exo1/analyse-syndrome-grippal.ipynb b/module3/exo1/analyse-syndrome-grippal.ipynb
index 59d72b5b58a3ae26346460dd39e62a39c55243d7..8d8f7392affccec6d6664d99b01d89b2f4f7f88b 100644
--- a/module3/exo1/analyse-syndrome-grippal.ipynb
+++ b/module3/exo1/analyse-syndrome-grippal.ipynb
@@ -28,15 +28,45 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {
-    "collapsed": true
-   },
+   "execution_count": 1,
+   "metadata": {},
    "outputs": [],
    "source": [
     "data_url = \"http://www.sentiweb.fr/datasets/incidence-PAY-3.csv\""
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Maintenant, je vais tester si un fichier local existe déjà avant de telecharger les donnés pour eviter d'avoir des donnés répétées."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The file https://app-learninglab.inria.fr/moocrr/jupyter/user/4bb0f49ad7e02c93b7804cb2c6776886/notebooks/work/module3/exo1/incidence-PAY-3.csv does not exist\n"
+     ]
+    }
+   ],
+   "source": [
+    "from pathlib import Path\n",
+    "\n",
+    "path_to_file = 'https://app-learninglab.inria.fr/moocrr/jupyter/user/4bb0f49ad7e02c93b7804cb2c6776886/notebooks/work/module3/exo1/incidence-PAY-3.csv'\n",
+    "path = Path(path_to_file)\n",
+    "\n",
+    "if path.is_file():\n",
+    "    print(f'The file {path_to_file} exists')\n",
+    "else:\n",
+    "    print(f'The file {path_to_file} does not exist')"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -364,7 +394,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.1"
+   "version": "3.6.4"
   }
  },
  "nbformat": 4,