Here is a complete code snippet that combines all the interleaved code you wrote in a nice executable codeblock:

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

Handling Duplicate Values in Columns and Assigning Values to Other Columns Using Dplyr

Merging Dataframes in R without Duplicates: A Step-by-Step Guide

Converting Long-Format Data to Wide Format in R: A Step-by-Step Guide

Splitting a Large DataFrame into Smaller Ones Based on Column Names Using Regular Expressions in Python

Understanding Data Aggregation in R: A Comprehensive Guide

Plotting Dates in Pandas with Line Connecting Duration Using Plotly's Timeline Function

Percentages Based on Specific Combinations of Binary and Numeric Values in a Data Frame

Optimizing Dataframe Access in R: A Better Approach Than Using assign