Efficiently Calling Python Functions with Arguments from a DataFrame

Applying a Function on a Column of a DataFrame Depending on the Value of Another Column and Then GroupBy Using NumPy's `where` Function and Pandas' `groupby` Method

Performing Row Subtraction in Pandas DataFrame Using np.where and diff() Method

Using Lambda Expressions to Query a DataTable Filled by SQL Statement

Using If-Else in a For Loop to Process One Column with Python Pandas