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Intro

What This Talk is About

Quick Poll

Type Hints Used to Be Informal • An example from the standard library

PEP 484: Type Hints . Based on function annotations, Python 3.5 - Explicit is better than implicit

The Main Benefit • Improved readability for both humans and tools • Documentation - More compact and easier to grasp than lengthy native

The Tools

The Example: ElementTree

Exceptions

Add Type Hints • Start with a few function annotations

Type Checking

Let's Annotate ElementTree's API - Most type hints are simple

Type Inference • Tools can infer types in some cases Follow assignments to variables Return types of local functions

Code Completion • Context-sensitive code completion

Docs with Type Hints • From the docstring using the Sphinx autodoc extension

Type Hints for Your Public APIs

From Simple to Complex

Liberal vs Conservative

Type Hints in Your Code • Type hints in Python 3 function annotations It's enough to pip install a library • Compatible with Python 3.5

Python Stubs

Available Type Hints

Try Type Hints!

Description:

Discover the benefits of type hints in Python through this informative conference talk from EuroPython 2015. Explore how PEP 484 introduces type hints for Python 3, enhancing code readability for both humans and tools. Learn practical examples of type hint usage, their value in public APIs, and how they can lead to better and safer outcomes. Gain insights into using simple class types and built-in collection types for public APIs, and understand the advantages of type hinting stubs for third-party libraries. Delve into topics such as informal type hints, function annotations, type checking, type inference, code completion, and documentation improvements. Examine the ElementTree API as a practical example, and explore the spectrum from simple to complex type hints. Understand the liberal vs. conservative approaches to type hinting, and learn how to implement type hints in your own code using Python 3 function annotations. Discover available type hints and leave inspired to try them in your Python projects. Read more

How You Can Benefit from Type Hints

EuroPython Conference

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