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Python Type Hints

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Avatar for Ayla Khan Ayla Khan
May 16, 2018
Technology
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Python Type Hints

PyLadies lightning talk about Python type hints

Avatar for Ayla Khan

Ayla Khan

May 16, 2018
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Transcript

  1. Python (3.5+) Type Hints Using Type Aliases

  2. What Are Python Type Hints? • New in 3.5 (provisional)

    • PEP484 • Optional (not enforced at runtime) ◦ Linter use recommended instead • Function annotations • Type Aliases, NewType, Callable, Generics ...

  3. Type Alias

  4. Type Alias Linting

  5. Type Alias At Runtime

  6. Type Alias

  7. Type Alias At Runtime

  8. Type Alias

  9. Type Alias

  10. Type Alias (Any type, implicit)

  11. Type Alias (Any type, implicit)

  12. Type Hints Advantages • Clarifies, “enforces” intent • Improves readability

    ◦ Simplifies type signatures • Improves testability • May prevent bugs

  13. Type Hints Disadvantages • Lose dynamic typing flexibility • Syntax

    complexity