diff --git a/03_classification.ipynb b/03_classification.ipynb
index f2dfa63..4a91f34 100644
--- a/03_classification.ipynb
+++ b/03_classification.ipynb
@@ -2259,10 +2259,9 @@
     "        return email\n",
     "    payload = email.get_payload()\n",
     "    if isinstance(payload, list):\n",
-    "        return \"multipart({})\".format(\", \".join([\n",
-    "            get_email_structure(sub_email)\n",
-    "            for sub_email in payload\n",
-    "        ]))\n",
+    "        multipart = \", \".join([get_email_structure(sub_email)\n",
+    "                               for sub_email in payload])\n",
+    "        return f\"multipart({multipart})\"\n",
     "    else:\n",
     "        return email.get_content_type()"
    ]
@@ -2742,8 +2741,8 @@
     "\n",
     "y_pred = log_clf.predict(X_test_transformed)\n",
     "\n",
-    "print(\"Precision: {:.2f}%\".format(100 * precision_score(y_test, y_pred)))\n",
-    "print(\"Recall: {:.2f}%\".format(100 * recall_score(y_test, y_pred)))"
+    "print(f\"Precision: {precision_score(y_test, y_pred):.2%}\")\n",
+    "print(f\"Recall: {recall_score(y_test, y_pred):.2%}\")"
    ]
   },
   {