Understanding np.select: A Powerful Tool for Conditional Column Generation in Pandas

Conditional Calculations on Different Sized Dataframes in Python Using Merging and Self-Joins

Creating Multiple Pandas Columns from a Function Returning a Dict

Understanding NumPy Apply Along Axis with Dates: A Comparison of Manual, Vectorized, and frompyfunc Approaches

How to Use NumPy Functions on Pandas Series Objects: Workarounds and Solutions

Adding a Column to a Pandas DataFrame Based on Multiple Conditions Using the `cut` Function