Functional Programming in Python

on YouTube ↗39m

" summary

Claims that Python supports functional style enough to be useful, demonstrates partial function application, currying, closures, decorators and function composition, and shows concrete code: a CSV parser reimplemented as composed map/filter/partial steps and a K‑means pipeline that runs on PySpark. Uses tool libraries (funktools, fn.py, toolz) for currying and composition, notes missing niceties like nicer lambda syntax and builtin immutability, and the examples run and clarify tradeoffs.

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" chapters (38)

1. 0:00Welcome Remarks
2. 0:19About Me (Daniel Kirsch)
3. 1:06About This Talk
4. 1:20Disclaimer - PEP 20
5. 3:19Vocabulary of Concepts
6. 3:47Purity (Functions Without Side-Effects)
7. 4:23First Class Functions
8. 4:54Higher-Order Functions
9. 5:32Decorators as Higher-Order Functions
10. 5:49Partial Function Application
11. 7:15Currying
12. 9:05Interlude: Closures
13. 9:55Currying Example from the Standard Library
14. 10:53Functional Collection Transformations (Map, Filter, & Reduce)
15. 11:04Map
16. 11:39Filter
17. 12:12Reduce
18. 14:01Function Composition
19. 15:16Example: A Bad CSV Parser (1/3)
20. 15:38Example: Imperative Python (2/3)
21. 16:18Example: Functional Python (3/3)
22. 20:35Example: PySpark
23. 21:26Example: K-Means
24. 23:15Main Takeaways
25. 23:53What is Missing in Python
26. 25:00Functional Libraries
27. 25:38Nicer Lambda Syntax
28. 26:05Other Interesting Stuff
29. 26:16Other Talks (Where I Have Stolen Material)
30. 27:13More FP?
31. 27:38Thank You
32. 28:10Audience Questions: Do you have a workaround for Immutability?
33. 29:58Audience Questions: Composition in Python is ugly, any workaround?
34. 31:43Audience Comment: Cannot assume the Pure Function example won't have a side-effect.
35. 32:43Audience Question: Underscore construct in PySpark
36. 34:39Audience Question: Any Python packages that try to mimic Scala like functional programming?
37. 35:34Audience Question: List Comprehensions are faster than map(), what is your take?
38. 38:17Last Question: Have you looked at Hy dialect?

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