Reshaping Pandas DataFrames from Long to Wide Format with Multiple Status Columns

Converting Long Data Frames to Longer Data Frames with Running Indicators in R

Reshaping Data from Wide to Long Format while Collapsing Variable Values for Same IDs in R

Converting Pandas DataFrames from Long to Wide Format Using Multi-Index Composite Keys

Reshaping Wide Format Data Using R and data.table Package

Stacking Columns by Looking at the First Column Using Pandas' lreshape Function in Python