Upgrade to Pro — share decks privately, control downloads, hide ads and more …

Python Type Hints

Sponsored · Your Podcast. Everywhere. Effortlessly. Share. Educate. Inspire. Entertain. You do you. We'll handle the rest. →
Avatar for José Padilla José Padilla
March 15, 2018
610
0

Python Type Hints

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

Avatar for José Padilla

José Padilla

March 15, 2018

More Decks by José Padilla

See All by José Padilla
Python, Government, and Contracts
Avatar for José Padilla jpadilla
0
70
Python, Government, and Contracts
Avatar for José Padilla jpadilla
0
5.1k
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
230
eventos
Avatar for José Padilla jpadilla
0
220
JWT
Avatar for José Padilla jpadilla
2
470
Ember.js + Django
Avatar for José Padilla jpadilla
3
2.2k
UPRB Basic Workshop
Avatar for José Padilla jpadilla
2
240

Featured

See All Featured
Principles of Awesome APIs and How to Build Them.
Avatar for Keavy McMinn keavy
128
17k
The Curious Case for Waylosing
Avatar for Cassini Nazir cassininazir
1
360
Self-Hosted WebAssembly Runtime for Runtime-Neutral Checkpoint/Restore in Edge–Cloud Continuum
Avatar for Yuki Nakata chikuwait chikuwait
0
540
Visualizing Your Data: Incorporating Mongo into Loggly Infrastructure
Avatar for mongodb mongodb
49
9.9k
From Legacy to Launchpad: Building Startup-Ready Communities
Avatar for Dug Song dugsong
0
210
[RailsConf 2023] Rails as a piece of cake
Avatar for Vladimir Dementyev palkan
59
6.6k
Ecommerce SEO: The Keys for Success Now & Beyond - #SERPConf2024
Avatar for Aleyda Solis aleyda
1
2k
世界の人気アプリ100個を分析して見えたペイウォール設計の心得
Avatar for Akihiro Kokubo akihiro_kokubo
PRO
70
39k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
Avatar for Eileen M. Uchitelle eileencodes
28
3.5k
Breaking role norms: Why Content Design is so much more than writing copy - Taylor Woolridge
Avatar for UX Y'all uxyall
0
290
Everyday Curiosity
Avatar for Cassini Nazir cassininazir
0
210
Bioeconomy Workshop: Dr. Julius Ecuru, Opportunities for a Bioeconomy in West Africa
Avatar for AKADEMIYA2063 akademiya2063
PRO
1
120

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