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 <li class="toctree-l1 current active has-children"><a class="current reference internal" href="#">2. Python Built-in Methods</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul>
 <li class="toctree-l2"><a class="reference internal" href="string.html">2.1. String</a></li>
 <li class="toctree-l2"><a class="reference internal" href="number.html">2.2. Number</a></li>
-<li class="toctree-l2 has-children"><a class="reference internal" href="list/list.html">2.3. List</a><input class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul>
-<li class="toctree-l3"><a class="reference internal" href="list/get_elements.html">2.3.1. Get Elements</a></li>
-<li class="toctree-l3"><a class="reference internal" href="list/unpack_iterables.html">2.3.2. Unpack Iterables</a></li>
-<li class="toctree-l3"><a class="reference internal" href="list/join_iterable.html">2.3.3. Join Iterables</a></li>
-<li class="toctree-l3"><a class="reference internal" href="list/apply_functions_to_elements.html">2.3.4. Apply Functions to Elements in a List</a></li>
+<li class="toctree-l2"><a class="reference internal" href="set.html">2.3. Set</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dictionary.html">2.4. Dictionary</a></li>
+<li class="toctree-l2"><a class="reference internal" href="function.html">2.5. Function</a></li>
+<li class="toctree-l2"><a class="reference internal" href="class.html">2.6. Classes</a></li>
+<li class="toctree-l2"><a class="reference internal" href="datetime.html">2.7. Datetime</a></li>
+<li class="toctree-l2"><a class="reference internal" href="code_speed.html">2.8. Code Speed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="good_practices.html">2.9. Good Python Practices</a></li>
+<li class="toctree-l2"><a class="reference internal" href="python_new_features.html">2.10. New Features in Python</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="set.html">2.4. Set</a></li>
-<li class="toctree-l2"><a class="reference internal" href="dictionary.html">2.5. Dictionary</a></li>
-<li class="toctree-l2"><a class="reference internal" href="function.html">2.6. Function</a></li>
-<li class="toctree-l2"><a class="reference internal" href="class.html">2.7. Classes</a></li>
-<li class="toctree-l2"><a class="reference internal" href="datetime.html">2.8. Datetime</a></li>
-<li class="toctree-l2"><a class="reference internal" href="code_speed.html">2.9. Code Speed</a></li>
-<li class="toctree-l2"><a class="reference internal" href="good_practices.html">2.10. Good Python Practices</a></li>
-<li class="toctree-l2"><a class="reference internal" href="python_new_features.html">2.11. New Features in Python</a></li>
-</ul>
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-<li class="toctree-l1 has-children"><a class="reference internal" href="../Chapter2/Chapter2.html">3. Python Utility Libraries</a><input class="toctree-checkbox" id="toctree-checkbox-3" name="toctree-checkbox-3" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-3"><i class="fa-solid fa-chevron-down"></i></label><ul>
+<li class="toctree-l1 has-children"><a class="reference internal" href="../Chapter2/Chapter2.html">3. Python Utility Libraries</a><input class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul>
 <li class="toctree-l2"><a class="reference internal" href="../Chapter2/collections.html">3.1. Collections</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../Chapter2/itertools.html">3.2. Itertools</a></li>
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 <li class="toctree-l2"><a class="reference internal" href="../Chapter2/pydantic.html">3.10. Pydantic</a></li>
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-<li class="toctree-l1 has-children"><a class="reference internal" href="../Chapter3/Chapter3.html">4. Pandas</a><input class="toctree-checkbox" id="toctree-checkbox-4" name="toctree-checkbox-4" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-4"><i class="fa-solid fa-chevron-down"></i></label><ul>
+<li class="toctree-l1 has-children"><a class="reference internal" href="../Chapter3/Chapter3.html">4. Pandas</a><input class="toctree-checkbox" id="toctree-checkbox-3" name="toctree-checkbox-3" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-3"><i class="fa-solid fa-chevron-down"></i></label><ul>
 <li class="toctree-l2"><a class="reference internal" href="../Chapter3/change_values.html">4.1. Change Values</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../Chapter3/get_values.html">4.2. Get Certain Values From a DataFrame</a></li>
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 <li class="toctree-l2"><a class="reference internal" href="../Chapter3/filter.html">4.7. Filter Rows or Columns</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../Chapter3/data_types.html">4.8. Manipulate a DataFrame Using Data Types</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../Chapter3/sort_dataframe.html">4.9. Sort Rows or Columns of a DataFrame</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../Chapter3/string.html">4.10. Work with String</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../Chapter3/string.html">4.10. String</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../Chapter3/style_dataframe.html">4.11. Style a DataFrame</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../Chapter3/testing.html">4.12. Test</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../Chapter3/testing.html">4.12. Testing</a></li>
 </ul>
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-<li class="toctree-l1 has-children"><a class="reference internal" href="../Chapter4/Chapter4.html">5. NumPy</a><input class="toctree-checkbox" id="toctree-checkbox-5" name="toctree-checkbox-5" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-5"><i class="fa-solid fa-chevron-down"></i></label><ul>
+<li class="toctree-l1 has-children"><a class="reference internal" href="../Chapter4/Chapter4.html">5. NumPy</a><input class="toctree-checkbox" id="toctree-checkbox-4" name="toctree-checkbox-4" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-4"><i class="fa-solid fa-chevron-down"></i></label><ul>
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-<li class="toctree-l1 has-children"><a class="reference internal" href="../Chapter5/Chapter5.html">6. Data Science Tools</a><input class="toctree-checkbox" id="toctree-checkbox-6" name="toctree-checkbox-6" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-6"><i class="fa-solid fa-chevron-down"></i></label><ul>
+<li class="toctree-l1 has-children"><a class="reference internal" href="../Chapter5/Chapter5.html">6. Data Science Tools</a><input class="toctree-checkbox" id="toctree-checkbox-5" name="toctree-checkbox-5" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-5"><i class="fa-solid fa-chevron-down"></i></label><ul>
 <li class="toctree-l2"><a class="reference internal" href="../Chapter5/feature_extraction.html">6.1. Feature Extraction</a></li>
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 <li class="toctree-l2"><a class="reference internal" href="../Chapter5/llm.html">6.17. Large Language Model (LLM)</a></li>
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-<li class="toctree-l1 has-children"><a class="reference internal" href="../Chapter6/Chapter6.html">7. Cool Tools</a><input class="toctree-checkbox" id="toctree-checkbox-7" name="toctree-checkbox-7" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-7"><i class="fa-solid fa-chevron-down"></i></label><ul>
+<li class="toctree-l1 has-children"><a class="reference internal" href="../Chapter6/Chapter6.html">7. Cool Tools</a><input class="toctree-checkbox" id="toctree-checkbox-6" name="toctree-checkbox-6" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-6"><i class="fa-solid fa-chevron-down"></i></label><ul>
 <li class="toctree-l2"><a class="reference internal" href="../Chapter6/best_python_practice_tools.html">7.1. Tools for Best Python Practices</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../Chapter6/alternative_approach.html">7.2. Alternative Approach</a></li>
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 <li class="toctree-l2"><a class="reference internal" href="../Chapter6/env_management.html">7.8. Environment Management</a></li>
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-<li class="toctree-l1 has-children"><a class="reference internal" href="../Chapter7/Chapter7.html">8. Jupyter Notebook</a><input class="toctree-checkbox" id="toctree-checkbox-8" name="toctree-checkbox-8" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-8"><i class="fa-solid fa-chevron-down"></i></label><ul>
+<li class="toctree-l1 has-children"><a class="reference internal" href="../Chapter7/Chapter7.html">8. Jupyter Notebook</a><input class="toctree-checkbox" id="toctree-checkbox-7" name="toctree-checkbox-7" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-7"><i class="fa-solid fa-chevron-down"></i></label><ul>
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