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):
...
Known issues
While using pathlib can improve the readability and type safety of your code,
it can be less performant than working directly with strings,
especially on older versions of Python.