lazy-fix
Check and fix Python imports into PEP 810 lazy imports.
PEP 810 adds a lazy soft keyword to Python 3.15: lazy import json and
lazy from pathlib import Path defer the import until the name is first
used. lazy-fix is a LibCST-based check/fix
CLI that finds eligible module-level imports and rewrites them to that
syntax.
Install
uv add --dev lazy-fix
Usage
lazy-fix check . # report non-lazy imports, exit 1 if any are found
lazy-fix fix . # rewrite them in place
lazy-fix fix . --diff # preview the changes without writing
Recurses by default, considers .py files only, and skips dot-prefixed
paths and anything .gitignore excludes. Which modules are eligible is
configured via [tool.lazy-fix] in pyproject.toml or a standalone
lazy-fix.toml — see the docs.
On projects whose requires-python doesn't allow 3.15 yet, fix inserts a
__lazy_modules__ marker list instead of the lazy import syntax itself —
PEP 810's own documented forward-compatibility mechanism.
Documentation
https://herogold.github.io/lazy-fix/
License
MIT
1 maintainer
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