Fluent Python: Clear, Concise, and Effective Programming, Luciano Ramalho, 2022 (O'Reilly Media) - A comprehensive guide to Python's advanced features, including a clear explanation of flexible function arguments and their practical implications in function design.
Python Cookbook, 3rd Edition, David Beazley and Brian K. Jones, 2013 (O'Reilly Media) - Offers practical recipes and solutions for advanced Python programming, including specific techniques for handling variable positional and keyword arguments in functions.