$30 off During Our Annual Pro Sale. View Details »

Python Type Hints

Avatar for José Padilla José Padilla
March 15, 2018
0
560

Python Type Hints

5min talk on Python Type Hints. Presented at newhaven.io

Avatar for José Padilla

José Padilla

March 15, 2018
Tweet

More Decks by José Padilla

See All by José Padilla
Python, Government, and Contracts
Avatar for José Padilla jpadilla
0
57
Python, Government, and Contracts
Avatar for José Padilla jpadilla
0
5k
Developer Ergonomics
Avatar for José Padilla jpadilla
0
2.1k
DjangoCon - JSON Web Tokens
Avatar for José Padilla jpadilla
15
11k
BFTW: The Backend
Avatar for José Padilla jpadilla
4
210
eventos
Avatar for José Padilla jpadilla
0
190
JWT
Avatar for José Padilla jpadilla
2
450
Ember.js + Django
Avatar for José Padilla jpadilla
3
2.1k
UPRB Basic Workshop
Avatar for José Padilla jpadilla
2
220

Featured

See All Featured
A designer walks into a library…
Avatar for Paul Jervis Heath pauljervisheath
210
24k
Measuring & Analyzing Core Web Vitals
Avatar for Philip Tellis bluesmoon
9
710
Intergalactic Javascript Robots from Outer Space
Avatar for Vicent Martí tanoku
273
27k
Reflections from 52 weeks, 52 projects
Avatar for Jefferson Lam jeffersonlam
355
21k
Practical Orchestrator
Avatar for Shlomi Noach shlominoach
190
11k
A Modern Web Designer's Workflow
Avatar for Chris Coyier chriscoyier
698
190k
Into the Great Unknown - MozCon
Avatar for Noah Learner thekraken
40
2.2k
Product Roadmaps are Hard
Avatar for C. Todd Lombardo iamctodd
PRO
55
12k
For a Future-Friendly Web
Avatar for Brad Frost brad_frost
180
10k
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
Avatar for Michelle Schulp Hunt marktimemedia
31
2.6k
Stop Working from a Prison Cell
Avatar for Chris Michel hatefulcrawdad
273
21k
How Fast Is Fast Enough? [PerfNow 2025]
Avatar for Tammy Everts tammyeverts
3
390

Transcript

  1. Type Hints

  2. José Padilla

  3. Work Training

  4. Work Open Source

  5. PEP 3107

  6. None

  7. PEP 484

  8. None

  9. no type checking happens at runtime

  10. static analysis refactoring runtime type checking code generation

  11. static analysis refactoring runtime type checking code generation

  12. None

  13. Common built-in types

  14. None
  15. None
  16. None
  17. None
  18. None
  19. None
  20. None
  21. None
  22. None
  23. None
  24. None
  25. None
  26. None

  27. Generics

  28. None
  29. None

  30. mypy

  31. static type checker

  32. $ pip install mypy

  33. $ python app.py

  34. None

  35. $ python app.py f 1 Traceback (most recent call last):

    File "app.py", line 12, in <module> print(first(1)) # TypeError File "app.py", line 7, in first return seq[0] TypeError: 'int' object is not subscriptable

  36. $ mypy app.py

  37. $ mypy app.py main.py:12: error: Argument 1 to "first" has

    incompatible type "int"; expected "Sequence[<nothing>]"
  38. None

  39. mypy-lang.org

  40. Python will remain a dynamically typed language

  41. Thanks! jpadilla.com twitter.com/@jpadilla_ github.com/jpadilla