PyCQA/isort

Support explicit lazy imports in Python 3.15 (PEP 810)

Open

#2,462 建立於 2026年2月25日

在 GitHub 查看
 (4 留言) (3 反應) (0 負責人)Python (6,146 star) (594 fork)batch import
enhancementhelp wanted

描述

PEP 810 "Explicit lazy imports" has been accepted and is coming to Python 3.15 (2026-03-10's 3.15.0a7 will be the first release).

This adds a new lazy keyword for imports:

lazy import json
lazy from json import dumps

And also a __lazy_modules__ for backwards compatibility with pre-3.15:

__lazy_modules__ = ["json"]
import json

It would be useful to also sort __lazy_modules__. Two options:

  • Alphabetical
  • Follow the isort settings, for example: stdlib, third-party, local

The Steering Council's acceptance said:

We agree that the PEP should take no position on any style recommendations for sorting lazy imports. While we generally like the idea of grouping lazy imports together, let’s leave that up to the linters and auto-formatters to decide the details.

See also https://github.com/astral-sh/ruff/issues/21305.

貢獻者指南

技術棧
python
領域
toolingdeveloper experience
議題類型
feature
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-2 days
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
fresh
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
understanding of PEP 810familiarity with isort codebase
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
35
研究方向
Study PEP 810 to understand the syntax for explicit lazy imports. Examine isort's parser to see how it currently handles import statements. Look at how isort categorizes imports (stdlib, third party, local). Then implement parsing of the `lazy` keyword and the ` lazy modules ` list. Finally, extend the sorting logic to include ` lazy modules ` following existing rules or alphabetically.