diff --git a/notebooks/introduction-python/exercises.ipynb b/notebooks/introduction-python/exercises.ipynb
index 33c8443..7c08bab 100644
--- a/notebooks/introduction-python/exercises.ipynb
+++ b/notebooks/introduction-python/exercises.ipynb
@@ -57,11 +57,11 @@
         "    print(k)"
       ],
       "metadata": {
-        "id": "j0bQ92RpJxJD",
-        "outputId": "2da549f3-8e2c-4b63-b9f0-9112880bc556",
         "colab": {
           "base_uri": "https://localhost:8080/"
-        }
+        },
+        "id": "j0bQ92RpJxJD",
+        "outputId": "2da549f3-8e2c-4b63-b9f0-9112880bc556"
       },
       "execution_count": 4,
       "outputs": [
@@ -116,11 +116,11 @@
         "merge(dict1, dict2, dict3)"
       ],
       "metadata": {
-        "id": "31pMhyRxIlXk",
-        "outputId": "cb4dd71e-316c-43ed-8c13-b418e82f4735",
         "colab": {
           "base_uri": "https://localhost:8080/"
-        }
+        },
+        "id": "31pMhyRxIlXk",
+        "outputId": "cb4dd71e-316c-43ed-8c13-b418e82f4735"
       },
       "execution_count": 6,
       "outputs": [
@@ -157,6 +157,33 @@
         "id": "LZJsa8ZR0zP3"
       }
     },
+    {
+      "cell_type": "code",
+      "source": [
+        "a = [1, 2, [3, 4]]\n",
+        "b = list(a)\n",
+        "\n",
+        "b[2][0] = -100\n",
+        "print(a)"
+      ],
+      "metadata": {
+        "id": "Lb7OAnhfLPBI",
+        "outputId": "28b704b0-310f-4f04-da69-3e42ae4e5152",
+        "colab": {
+          "base_uri": "https://localhost:8080/"
+        }
+      },
+      "execution_count": 8,
+      "outputs": [
+        {
+          "output_type": "stream",
+          "name": "stdout",
+          "text": [
+            "[1, 2, [-100, 4]]\n"
+          ]
+        }
+      ]
+    },
     {
       "cell_type": "markdown",
       "metadata": {
@@ -186,6 +213,113 @@
         ":::"
       ]
     },
+    {
+      "cell_type": "code",
+      "source": [
+        "[i for i in str(-5438543)]"
+      ],
+      "metadata": {
+        "id": "EQsCkCB-PS-9",
+        "outputId": "2451f1e3-043e-404d-b536-853d22186691",
+        "colab": {
+          "base_uri": "https://localhost:8080/"
+        }
+      },
+      "execution_count": 18,
+      "outputs": [
+        {
+          "output_type": "execute_result",
+          "data": {
+            "text/plain": [
+              "['-', '5', '4', '3', '8', '5', '4', '3']"
+            ]
+          },
+          "metadata": {},
+          "execution_count": 18
+        }
+      ]
+    },
+    {
+      "cell_type": "code",
+      "source": [
+        "def traduce(objeto):\n",
+        "    if isinstance(objeto, int) and not isinstance(objeto, bool):\n",
+        "        return traduce_entero(objeto)\n",
+        "\n",
+        "    if isinstance(objeto, float):\n",
+        "        return traduce_flotante(objeto)\n",
+        "\n",
+        "    if isinstance(objeto, str):\n",
+        "        return objeto\n",
+        "\n",
+        "    return \"<OTRO>\"\n",
+        "\n",
+        "def traduce_entero(n):\n",
+        "    n_str = str(n)\n",
+        "    digits = [i for i in n_str]\n",
+        "    return \"-\".join([traduce_digito(digit) for digit in digits])\n",
+        "\n",
+        "traductor_digitos = {\n",
+        "    \"1\": \"uno\",\n",
+        "    \"2\": \"dos\",\n",
+        "    \"3\": \"tres\",\n",
+        "    \"4\": \"cuatro\",\n",
+        "    \"5\": \"cinco\",\n",
+        "    \"6\": \"seis\",\n",
+        "    \"7\": \"siete\",\n",
+        "    \"8\": \"ocho\",\n",
+        "    \"9\": \"nueve\",\n",
+        "    \"0\": \"cero\",\n",
+        "    \"-\": \"menos\"\n",
+        "}\n",
+        "\n",
+        "def traduce_digito(digito):\n",
+        "    return traductor_digitos[digito]\n",
+        "\n",
+        "def traduce_flotante(f):\n",
+        "    f_rounded = round(f)\n",
+        "    return traduce_entero(f_rounded) + \" y decimales\"\n",
+        "\n",
+        "def concat_to_str(iterable):\n",
+        "    traducciones = [traduce(i) for i in iterable]\n",
+        "    return \" | \".join(traducciones)"
+      ],
+      "metadata": {
+        "id": "VuCGnWA0NI_n"
+      },
+      "execution_count": 22,
+      "outputs": []
+    },
+    {
+      "cell_type": "code",
+      "source": [
+        "concat_to_str([12, -14.23, \"hello\", True, None, 10.1, -5])"
+      ],
+      "metadata": {
+        "id": "bBzRmtoYPFCx",
+        "outputId": "3fa62372-1e1f-489e-fec7-7cf1d9e39039",
+        "colab": {
+          "base_uri": "https://localhost:8080/",
+          "height": 36
+        }
+      },
+      "execution_count": 23,
+      "outputs": [
+        {
+          "output_type": "execute_result",
+          "data": {
+            "text/plain": [
+              "'uno-dos | menos-uno-cuatro y decimales | hello | <OTRO> | <OTRO> | uno-cero y decimales | menos-cinco'"
+            ],
+            "application/vnd.google.colaboratory.intrinsic+json": {
+              "type": "string"
+            }
+          },
+          "metadata": {},
+          "execution_count": 23
+        }
+      ]
+    },
     {
       "cell_type": "markdown",
       "source": [