Explore the power of functional programming in Python for data science and machine learning applications in this 33-minute PyCon US talk. Discover how Python's versatility supports multiple programming styles, with a focus on functional approaches for data filtering and processing. Learn about pure functions, the pitfalls of mutable function parameters, and essential Python modules like itertools and functools. Gain insights into the map-reduce data processing pattern and see practical applications through functional-style solutions to Advent of Code puzzles. Enhance your Python skills and tackle data challenges more effectively with this informative and interactive presentation.