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
72
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
480
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
The MySQL Ecosystem @ GitHub 2015
Avatar for Sam Lambert samlambert
251
13k
30 Presentation Tips
Avatar for Ian Lurie portentint
PRO
1
320
B2B Lead Gen: Tactics, Traps & Triumph
Avatar for Sophie Logan marketingsoph
0
140
The Curious Case for Waylosing
Avatar for Cassini Nazir cassininazir
1
380
Designing for Performance
Avatar for Lara Hogan lara
611
70k
The Illustrated Guide to Node.js - THAT Conference 2024
Avatar for David Neal reverentgeek
1
380
Producing Creativity
Avatar for Steve Smith orderedlist
PRO
348
40k
BBQ
Avatar for Matthew Crist matthewcrist
89
10k
From Legacy to Launchpad: Building Startup-Ready Communities
Avatar for Dug Song dugsong
0
230
How to build an LLM SEO readiness audit: a practical framework
Avatar for Nick Samuel nmsamuel
1
770
Efficient Content Optimization with Google Search Console & Apps Script
Avatar for Katarina Dahlin katarinadahlin
PRO
1
600
The Hidden Cost of Media on the Web [PixelPalooza 2025]
Avatar for Tammy Everts tammyeverts
2
330

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