Home > Backend Development > Python Tutorial > How Do Python 3\'s Function Annotations Handle Collection Type Hinting?

How Do Python 3\'s Function Annotations Handle Collection Type Hinting?

Susan Sarandon
Release: 2024-11-01 01:42:28
Original
1093 people have browsed it

 How Do Python 3's Function Annotations Handle Collection Type Hinting?

Function Annotations for Collection Type Hinting

In Python 3, function annotations are a common approach for specifying types, particularly for homogeneous collections (e.g., lists). However, users sought a method to incorporate collection types into these annotations.

Docstring-Based Type Hinting

Initially, Python developers relied on formatted docstrings, such as reStructuredText or Sphinx, to provide collection type information. These approaches were supported by IDEs, but they were not as concise or integrated as annotations.

登場*

A significant breakthrough came with PEP 484 (Type Hints) and Python 3.5's introduction of the typing module. This enhancement allowed developers to specify types within collections using type annotations.

For instance, a list of strings can be annotated as:

<code class="python">from typing import List

def do_something(l: List[str]):
    for s in l:
        s  # str</code>
Copy after login

This annotation denotes that the function expects a list of strings, and type information is reflected in IDE code completion.

Constraints

Initially, specifying types within collections using annotations was not supported. However, this limitation was addressed in Python 3.5.

Conclusion

Type annotations now provide a comprehensive and convenient way to specify collection types, enhancing type checking and IDE code completion facilities for Python developers.

The above is the detailed content of How Do Python 3\'s Function Annotations Handle Collection Type Hinting?. For more information, please follow other related articles on the PHP Chinese website!

source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template