Pandas - GroupBy and Transform
The groupby() operation splits a DataFrame into groups based on one or more keys, applies a function to each group, and combines the results. This split-apply-combine pattern is fundamental to data…
Transform
How to Use Transform in Pandas
Pandas gives you three main methods for applying functions to data: apply(), agg(), and transform(). Understanding when to use each one will save you hours of debugging and rewriting code.
ETL Pipelines: Extract, Transform, Load
ETL stands for Extract, Transform, Load—three distinct phases that move data from source systems into a format and location suitable for analysis. Every organization with more than one data source…
Read more →