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

Python Type Hints

Avatar for José Padilla José Padilla
March 15, 2018
0
580

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
58
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
220
eventos
Avatar for José Padilla jpadilla
0
200
JWT
Avatar for José Padilla jpadilla
2
460
Ember.js + Django
Avatar for José Padilla jpadilla
3
2.2k
UPRB Basic Workshop
Avatar for José Padilla jpadilla
2
230

Featured

See All Featured
The Cost Of JavaScript in 2023
Avatar for Addy Osmani addyosmani
55
9.5k
Noah Learner - AI + Me: how we built a GSC Bulk Export data pipeline
Avatar for Tech SEO Connect techseoconnect
PRO
0
100
Designing for humans not robots
Avatar for Tammie Lister tammielis
254
26k
More Than Pixels: Becoming A User Experience Designer
Avatar for Michelle Schulp Hunt marktimemedia
3
320
Data-driven link building: lessons from a $708K investment (BrightonSEO talk)
Avatar for Szymon szymonslowik
1
910
jQuery: Nuts, Bolts and Bling
Avatar for Doug Neiner dougneiner
65
8.4k
Digital Ethics as a Driver of Design Innovation
Avatar for Per Axbom axbom
PRO
1
170
Breaking role norms: Why Content Design is so much more than writing copy - Taylor Woolridge
Avatar for UX Y'all uxyall
0
160
We Analyzed 250 Million AI Search Results: Here's What I Found
Avatar for Josh Blyskal joshbly
1
690
AI Search: Implications for SEO and How to Move Forward - #ShenzhenSEOConference
Avatar for Aleyda Solis aleyda
1
1.1k
[SF Ruby Conf 2025] Rails X
Avatar for Vladimir Dementyev palkan
1
740
How to Ace a Technical Interview
Avatar for Jacob Kaplan-Moss jacobian
281
24k

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