Skip to content

os-path-splitext (PTH122)#

Derived from the flake8-use-pathlib linter.

What it does#

Checks for uses of os.path.splitext.

Why is this bad?#

pathlib offers a high-level API for path manipulation, as compared to the lower-level API offered by os. When possible, using Path object methods such as Path.suffix and Path.stem can improve readability over the os module's counterparts (e.g., os.path.splitext()).

os.path.splitext() specifically returns a tuple of the file root and extension (e.g., given splitext('/foo/'), os.path.splitext() returns ("foo/bar", ".py"). These outputs can be reconstructed through a combination of Path.suffix (".py"), Path.stem ("bar"), and Path.parent ("foo").

Note that os functions may be preferable if performance is a concern, e.g., in hot loops.


import os

(root, ext) = os.path.splitext("foo/")

Use instead:

from pathlib import Path

path = Path("foo/")
root = path.parent / path.stem
ext = path.suffix