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Python Type Hints

Avatar for José Padilla José Padilla
March 15, 2018
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Python Type Hints

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

Avatar for José Padilla

José Padilla

March 15, 2018
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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