Understanding the DataFrameGroupby Cumsum Function Behaviour for Sparse Columns

Filtering Data with Pandas: A More Efficient Approach Than Iteration

Avoiding Lists of Comprehension: A Costly Memory Approach for Efficient Data Processing in Python

The problem is that you're trying to append data to `final_dataframe` using `_append`, which doesn't work because it's not designed for appending rows.

Extracting Information from Multiple DataFrames in Python: A Comprehensive Guide

Setting Maximum Value (Upper Bound) for Columns in pandas DataFrame Using clip Method

Enforcing Data Properties with Pandas: A Comprehensive Guide

Selecting Columns of Data Frame Based on Another Column's Value

Padded DataFrames: A Guide to Reshaping and Reindexing with Python's pandas Library

How to Collapse Rows in a Pandas Multi-Index DataFrame