Reshape and Group by Operations in Pandas DataFrames: A Comparative Approach

Reshaping Data to Plot in R using ggplot2

Here's the complete code with all methods:

Understanding Long-Format Data and the Need for Reshaping Using Pivot_Wider in R Programming Language

Reshaping Wide Format Data Using R and data.table Package

Replicating Columns in Dataframe: Summing Up Values and Keeping Rows Unique with Base R, Dplyr/Tidyr, and Purrr