How you can benefit from type hints

on YouTube ↗35m

" summary

PEP 484 adds optional type hints to Python 3 and the claim is concrete: simple annotations let tools catch real bugs (ElementTree code that passes bytes where str and an illegal indexed iterator), with mypy and PyCharm reporting the errors (PyCharm underlines, mypy prints messages). PyCharm 4.5 has partial support and 5 aims for full support. Use type stubs (.pyi) for Python 2 or third‑party libs, and annotate public APIs with simple types first.

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" chapters (22)

1. 0:00Intro
2. 1:17What This Talk is About
3. 1:57Quick Poll
4. 2:36Type Hints Used to Be Informal • An example from the standard library
5. 3:06PEP 484: Type Hints . Based on function annotations, Python 3.5 - Explicit is better than implicit
6. 3:40The Main Benefit • Improved readability for both humans and tools • Documentation - More compact and easier to grasp than lengthy native
7. 4:34The Tools
8. 5:49The Example: ElementTree
9. 7:17Exceptions
10. 7:43Add Type Hints • Start with a few function annotations
11. 8:18Type Checking
12. 8:47Let's Annotate ElementTree's API - Most type hints are simple
13. 9:56Type Inference • Tools can infer types in some cases Follow assignments to variables Return types of local functions
14. 13:49Code Completion • Context-sensitive code completion
15. 15:58Docs with Type Hints • From the docstring using the Sphinx autodoc extension
16. 17:25Type Hints for Your Public APIs
17. 19:26From Simple to Complex
18. 20:20Liberal vs Conservative
19. 21:54Type Hints in Your Code • Type hints in Python 3 function annotations It's enough to pip install a library • Compatible with Python 3.5
20. 23:16Python Stubs
21. 26:21Available Type Hints
22. 27:22Try Type Hints!

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