os-sep-split (PTH206)

Derived from the flake8-use-pathlib linter.

What it does

Checks for uses of .split(os.sep)

Why is this bad?

The pathlib module in the standard library should be used for path manipulation. It provides a high-level API with the functionality needed for common operations on Path objects.

Example

If not all parts of the path are needed, then the name and parent attributes of the Path object should be used. Otherwise, the parts attribute can be used as shown in the last example.

import os

"path/to/file_name.txt".split(os.sep)[-1]

"path/to/file_name.txt".split(os.sep)[-2]

# Iterating over the path parts
if any(part in blocklist for part in "my/file/path".split(os.sep)):
    ...

Use instead:

from pathlib import Path

Path("path/to/file_name.txt").name

Path("path/to/file_name.txt").parent.name

# Iterating over the path parts
if any(part in blocklist for part in Path("my/file/path").parts):
    ...