Here is the complete code with comments:

Mastering Simultaneous Object Updates: Strategies for Efficient Data Manipulation with Python's Data Libraries

Overcoming Pandas GroupBy Limitations: Techniques for Complex Data Manipulation

Improving String Comparison and Extraction Performance in Pandas DataFrames

Accessing Specific Elements and Columns in Pandas DataFrames

Understanding How to Handle Missing Values in Pandas DataFrames

Handling Matches in Either Column: A Flexible Approach for Pandas Joins

Returning Multiple Nearest Neighbors with Scikit-Learn's NearestNeighbors Class

Calculating Cumulative Inventory Levels with Nested Index Groups in Python Using Pandas

Dynamically Reassigning SQL Query Object Properties with Python and Flask SQLAlchemy