diff --git a/06_text/00_content.ipynb b/06_text/00_content.ipynb
index 236942b..f1f6871 100644
--- a/06_text/00_content.ipynb
+++ b/06_text/00_content.ipynb
@@ -1678,13 +1678,13 @@
    "outputs": [
     {
      "ename": "TypeError",
-     "evalue": "string indices must be integers",
+     "evalue": "string indices must be integers, not 'float'",
      "output_type": "error",
      "traceback": [
       "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
       "\u001b[0;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
-      "\u001b[0;32m<ipython-input-54-31fb90bbe515>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mtext\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;36m1.0\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
-      "\u001b[0;31mTypeError\u001b[0m: string indices must be integers"
+      "Cell \u001b[0;32mIn[54], line 1\u001b[0m\n\u001b[0;32m----> 1\u001b[0m \u001b[43mtext\u001b[49m\u001b[43m[\u001b[49m\u001b[38;5;241;43m1.0\u001b[39;49m\u001b[43m]\u001b[49m\n",
+      "\u001b[0;31mTypeError\u001b[0m: string indices must be integers, not 'float'"
      ]
     }
    ],
@@ -1754,7 +1754,7 @@
      "traceback": [
       "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
       "\u001b[0;31mIndexError\u001b[0m                                Traceback (most recent call last)",
-      "\u001b[0;32m<ipython-input-56-ffa3e1bc2f86>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mtext\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;36m27\u001b[0m\u001b[0;34m]\u001b[0m  \u001b[0;31m# == text[len(text)]\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
+      "Cell \u001b[0;32mIn[56], line 1\u001b[0m\n\u001b[0;32m----> 1\u001b[0m \u001b[43mtext\u001b[49m\u001b[43m[\u001b[49m\u001b[38;5;241;43m27\u001b[39;49m\u001b[43m]\u001b[49m  \u001b[38;5;66;03m# == text[len(text)]\u001b[39;00m\n",
       "\u001b[0;31mIndexError\u001b[0m: string index out of range"
      ]
     }
@@ -2315,7 +2315,7 @@
      "traceback": [
       "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
       "\u001b[0;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
-      "\u001b[0;32m<ipython-input-72-d8a1e6b0b786>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mtext\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;36m0\u001b[0m\u001b[0;34m]\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;34m\"X\"\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
+      "Cell \u001b[0;32mIn[72], line 1\u001b[0m\n\u001b[0;32m----> 1\u001b[0m \u001b[43mtext\u001b[49m\u001b[43m[\u001b[49m\u001b[38;5;241;43m0\u001b[39;49m\u001b[43m]\u001b[49m \u001b[38;5;241m=\u001b[39m \u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mX\u001b[39m\u001b[38;5;124m\"\u001b[39m\n",
       "\u001b[0;31mTypeError\u001b[0m: 'str' object does not support item assignment"
      ]
     }
@@ -2340,7 +2340,7 @@
      "traceback": [
       "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
       "\u001b[0;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
-      "\u001b[0;32m<ipython-input-73-def135e84998>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mtext\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;36m5\u001b[0m\u001b[0;34m]\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;34m\"random\"\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
+      "Cell \u001b[0;32mIn[73], line 1\u001b[0m\n\u001b[0;32m----> 1\u001b[0m \u001b[43mtext\u001b[49m\u001b[43m[\u001b[49m\u001b[43m:\u001b[49m\u001b[38;5;241;43m5\u001b[39;49m\u001b[43m]\u001b[49m \u001b[38;5;241m=\u001b[39m \u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mrandom\u001b[39m\u001b[38;5;124m\"\u001b[39m\n",
       "\u001b[0;31mTypeError\u001b[0m: 'str' object does not support item assignment"
      ]
     }
@@ -3938,7 +3938,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.6"
+   "version": "3.12.2"
   },
   "livereveal": {
    "auto_select": "code",
diff --git a/06_text/01_exercises.ipynb b/06_text/01_exercises.ipynb
index 0781f2b..89dc687 100644
--- a/06_text/01_exercises.ipynb
+++ b/06_text/01_exercises.ipynb
@@ -974,7 +974,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.6"
+   "version": "3.12.2"
   },
   "toc": {
    "base_numbering": 1,
diff --git a/06_text/02_content.ipynb b/06_text/02_content.ipynb
index 6ff2407..fc5efa3 100644
--- a/06_text/02_content.ipynb
+++ b/06_text/02_content.ipynb
@@ -315,6 +315,16 @@
       "C:\\Programs\n",
       "ew_application\n"
      ]
+    },
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "<>:1: SyntaxWarning: invalid escape sequence '\\P'\n",
+      "<>:1: SyntaxWarning: invalid escape sequence '\\P'\n",
+      "/tmp/ipykernel_159416/1102122489.py:1: SyntaxWarning: invalid escape sequence '\\P'\n",
+      "  print(\"C:\\Programs\\new_application\")\n"
+     ]
     }
    ],
    "source": [
@@ -343,10 +353,10 @@
    "outputs": [
     {
      "ename": "SyntaxError",
-     "evalue": "(unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \\UXXXXXXXX escape (<ipython-input-10-61308f43d404>, line 1)",
+     "evalue": "(unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \\UXXXXXXXX escape (2296736867.py, line 1)",
      "output_type": "error",
      "traceback": [
-      "\u001b[0;36m  File \u001b[0;32m\"<ipython-input-10-61308f43d404>\"\u001b[0;36m, line \u001b[0;32m1\u001b[0m\n\u001b[0;31m    print(\"C:\\Users\\Administrator\\Desktop\\Project\")\u001b[0m\n\u001b[0m          ^\u001b[0m\n\u001b[0;31mSyntaxError\u001b[0m\u001b[0;31m:\u001b[0m (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \\UXXXXXXXX escape\n"
+      "\u001b[0;36m  Cell \u001b[0;32mIn[10], line 1\u001b[0;36m\u001b[0m\n\u001b[0;31m    print(\"C:\\Users\\Administrator\\Desktop\\Project\")\u001b[0m\n\u001b[0m          ^\u001b[0m\n\u001b[0;31mSyntaxError\u001b[0m\u001b[0;31m:\u001b[0m (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \\UXXXXXXXX escape\n"
      ]
     }
    ],
@@ -1174,10 +1184,10 @@
    "outputs": [
     {
      "ename": "SyntaxError",
-     "evalue": "EOL while scanning string literal (<ipython-input-34-4cef690f1f4a>, line 1)",
+     "evalue": "unterminated string literal (detected at line 1) (2682216481.py, line 1)",
      "output_type": "error",
      "traceback": [
-      "\u001b[0;36m  File \u001b[0;32m\"<ipython-input-34-4cef690f1f4a>\"\u001b[0;36m, line \u001b[0;32m1\u001b[0m\n\u001b[0;31m    \"\u001b[0m\n\u001b[0m     ^\u001b[0m\n\u001b[0;31mSyntaxError\u001b[0m\u001b[0;31m:\u001b[0m EOL while scanning string literal\n"
+      "\u001b[0;36m  Cell \u001b[0;32mIn[34], line 1\u001b[0;36m\u001b[0m\n\u001b[0;31m    \"\u001b[0m\n\u001b[0m    ^\u001b[0m\n\u001b[0;31mSyntaxError\u001b[0m\u001b[0;31m:\u001b[0m unterminated string literal (detected at line 1)\n"
      ]
     }
    ],
@@ -1835,7 +1845,7 @@
      "traceback": [
       "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
       "\u001b[0;31mUnicodeDecodeError\u001b[0m                        Traceback (most recent call last)",
-      "\u001b[0;32m<ipython-input-55-1630cf8a20cc>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mplace\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mencode\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"iso-8859-1\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mdecode\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
+      "Cell \u001b[0;32mIn[55], line 1\u001b[0m\n\u001b[0;32m----> 1\u001b[0m \u001b[43mplace\u001b[49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43mencode\u001b[49m\u001b[43m(\u001b[49m\u001b[38;5;124;43m\"\u001b[39;49m\u001b[38;5;124;43miso-8859-1\u001b[39;49m\u001b[38;5;124;43m\"\u001b[39;49m\u001b[43m)\u001b[49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43mdecode\u001b[49m\u001b[43m(\u001b[49m\u001b[43m)\u001b[49m\n",
       "\u001b[0;31mUnicodeDecodeError\u001b[0m: 'utf-8' codec can't decode byte 0xe9 in position 3: invalid continuation byte"
      ]
     }
@@ -1871,7 +1881,7 @@
      "traceback": [
       "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
       "\u001b[0;31mUnicodeEncodeError\u001b[0m                        Traceback (most recent call last)",
-      "\u001b[0;32m<ipython-input-56-8dd3b1bfcf5d>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0;34m\"Dobrý den, přátelé!\"\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mencode\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"iso-8859-1\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
+      "Cell \u001b[0;32mIn[56], line 1\u001b[0m\n\u001b[0;32m----> 1\u001b[0m \u001b[38;5;124;43m\"\u001b[39;49m\u001b[38;5;124;43mDobrý den, přátelé!\u001b[39;49m\u001b[38;5;124;43m\"\u001b[39;49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43mencode\u001b[49m\u001b[43m(\u001b[49m\u001b[38;5;124;43m\"\u001b[39;49m\u001b[38;5;124;43miso-8859-1\u001b[39;49m\u001b[38;5;124;43m\"\u001b[39;49m\u001b[43m)\u001b[49m\n",
       "\u001b[0;31mUnicodeEncodeError\u001b[0m: 'latin-1' codec can't encode character '\\u0159' in position 12: ordinal not in range(256)"
      ]
     }
@@ -1918,8 +1928,8 @@
      "traceback": [
       "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
       "\u001b[0;31mUnicodeDecodeError\u001b[0m                        Traceback (most recent call last)",
-      "\u001b[0;32m<ipython-input-57-83a7d1245cc7>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      1\u001b[0m \u001b[0;32mwith\u001b[0m \u001b[0mopen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"umlauts.txt\"\u001b[0m\u001b[0;34m)\u001b[0m \u001b[0;32mas\u001b[0m \u001b[0mfile\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m     \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"\"\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mjoin\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mfile\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mreadlines\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
-      "\u001b[0;32m~/.pyenv/versions/3.8.6/lib/python3.8/codecs.py\u001b[0m in \u001b[0;36mdecode\u001b[0;34m(self, input, final)\u001b[0m\n\u001b[1;32m    320\u001b[0m         \u001b[0;31m# decode input (taking the buffer into account)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    321\u001b[0m         \u001b[0mdata\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mbuffer\u001b[0m \u001b[0;34m+\u001b[0m \u001b[0minput\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 322\u001b[0;31m         \u001b[0;34m(\u001b[0m\u001b[0mresult\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mconsumed\u001b[0m\u001b[0;34m)\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m_buffer_decode\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mdata\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0merrors\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mfinal\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    323\u001b[0m         \u001b[0;31m# keep undecoded input until the next call\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    324\u001b[0m         \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mbuffer\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mdata\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0mconsumed\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+      "Cell \u001b[0;32mIn[57], line 2\u001b[0m\n\u001b[1;32m      1\u001b[0m \u001b[38;5;28;01mwith\u001b[39;00m \u001b[38;5;28mopen\u001b[39m(\u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mumlauts.txt\u001b[39m\u001b[38;5;124m\"\u001b[39m) \u001b[38;5;28;01mas\u001b[39;00m file:\n\u001b[0;32m----> 2\u001b[0m     \u001b[38;5;28mprint\u001b[39m(\u001b[38;5;124m\"\u001b[39m\u001b[38;5;124m\"\u001b[39m\u001b[38;5;241m.\u001b[39mjoin(\u001b[43mfile\u001b[49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43mreadlines\u001b[49m\u001b[43m(\u001b[49m\u001b[43m)\u001b[49m))\n",
+      "File \u001b[0;32m<frozen codecs>:322\u001b[0m, in \u001b[0;36mdecode\u001b[0;34m(self, input, final)\u001b[0m\n",
       "\u001b[0;31mUnicodeDecodeError\u001b[0m: 'utf-8' codec can't decode byte 0xe4 in position 9: invalid continuation byte"
      ]
     }
@@ -2068,7 +2078,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.6"
+   "version": "3.12.2"
   },
   "livereveal": {
    "auto_select": "code",
diff --git a/06_text/03_summary.ipynb b/06_text/03_summary.ipynb
index bcb6506..f3ac4d7 100644
--- a/06_text/03_summary.ipynb
+++ b/06_text/03_summary.ipynb
@@ -43,7 +43,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.6"
+   "version": "3.12.2"
   },
   "livereveal": {
    "auto_select": "code",
diff --git a/06_text/04_review.ipynb b/06_text/04_review.ipynb
index 9804bfc..b92cb56 100644
--- a/06_text/04_review.ipynb
+++ b/06_text/04_review.ipynb
@@ -178,7 +178,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.6"
+   "version": "3.12.2"
   },
   "toc": {
    "base_numbering": 1,
diff --git a/06_text/05_resources.ipynb b/06_text/05_resources.ipynb
index a5517f1..24882f9 100644
--- a/06_text/05_resources.ipynb
+++ b/06_text/05_resources.ipynb
@@ -62,6 +62,7 @@
        "            src=\"https://www.youtube.com/embed/MijmeoH9LT4\"\n",
        "            frameborder=\"0\"\n",
        "            allowfullscreen\n",
+       "            \n",
        "        ></iframe>\n",
        "        "
       ],
@@ -87,7 +88,7 @@
     }
    },
    "source": [
-    "In his [PyCon Australia 2018](https://2018.pycon-au.org/) talk titled \"*Unicode and Python: The absolute minimum you need to know*\" [Raphaël Merx](https://www.linkedin.com/in/raphaelmerx/) explains some caveats and best practices regarding Unicode."
+    "In his [PyCon Australia 2018](https://2018.pycon-au.org/) talk titled \"*Unicode and Python: The absolute minimum you need to know*\" [Raphaël Merx](https://www.linkedin.com/raphaelmerx/) explains some caveats and best practices regarding Unicode."
    ]
   },
   {
@@ -110,6 +111,7 @@
        "            src=\"https://www.youtube.com/embed/oXVmZGN6plY\"\n",
        "            frameborder=\"0\"\n",
        "            allowfullscreen\n",
+       "            \n",
        "        ></iframe>\n",
        "        "
       ],
@@ -134,7 +136,7 @@
     }
    },
    "source": [
-    "In a similar talk at [PyCon 2017](https://us.pycon.org/2017/) titled \"*Unicode what is the big deal*\" [Łukasz Langa](https://www.linkedin.com/in/llanga/) provides further lessons learned regarding Unicode."
+    "In a similar talk at [PyCon 2017](https://us.pycon.org/2017/) titled \"*Unicode what is the big deal*\" [Łukasz Langa](https://www.linkedin.com/llanga/) provides further lessons learned regarding Unicode."
    ]
   },
   {
@@ -157,6 +159,7 @@
        "            src=\"https://www.youtube.com/embed/7m5JA3XaZ4k\"\n",
        "            frameborder=\"0\"\n",
        "            allowfullscreen\n",
+       "            \n",
        "        ></iframe>\n",
        "        "
       ],
@@ -204,6 +207,7 @@
        "            src=\"https://www.youtube.com/embed/sgHbC6udIqc\"\n",
        "            frameborder=\"0\"\n",
        "            allowfullscreen\n",
+       "            \n",
        "        ></iframe>\n",
        "        "
       ],
@@ -235,7 +239,7 @@
     }
    },
    "source": [
-    "Lastly, in his entertaining talk at [PyCon.DE 2019](https://de.pycon.org/) titled \"*Your Name is Invalid!*\" [Miroslav Šedivý](https://www.linkedin.com/in/%C5%A1ediv%C3%BD/) shows how hard it actually is to write software that can process any name a human can possibly have. Miroslav also gave a lightning talk where he shows how he uses only one keyboard for the 12 (!!!) languages he speaks."
+    "Lastly, in his entertaining talk at [PyCon.DE 2019](https://de.pycon.org/) titled \"*Your Name is Invalid!*\" [Miroslav Šedivý](https://www.linkedin.com/%C5%A1ediv%C3%BD/) shows how hard it actually is to write software that can process any name a human can possibly have. Miroslav also gave a lightning talk where he shows how he uses only one keyboard for the 12 (!!!) languages he speaks."
    ]
   },
   {
@@ -258,6 +262,7 @@
        "            src=\"https://www.youtube.com/embed/pBuS7EUPnQA\"\n",
        "            frameborder=\"0\"\n",
        "            allowfullscreen\n",
+       "            \n",
        "        ></iframe>\n",
        "        "
       ],
@@ -294,6 +299,7 @@
        "            src=\"https://www.youtube.com/embed/-4QjII981sM\"\n",
        "            frameborder=\"0\"\n",
        "            allowfullscreen\n",
+       "            \n",
        "        ></iframe>\n",
        "        "
       ],
@@ -327,7 +333,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.6"
+   "version": "3.12.2"
   },
   "livereveal": {
    "auto_select": "code",