Achieving Percentage Append Next to Value Counts in DataFrame Without Appending Extra Columns

Applying a Custom Function to Grouped DataFrames: A Step-by-Step Guide

Optimizing Data Append and Overwrite in Python Scripts Using Pandas

Understanding the Difference Between Python's append() and extend() Methods

Applying Pandas Series to Append Rows to an Existing DataFrame

Append Rows of df2 to Existing df 1 Based on Matching Conditions

Why pd.concat Doesn't Behave as Expected When Appending a Series with an Index Matching Columns

Modifying User-Defined Functions in R to Append Output to External Vectors without Printing Results