Registry / testing / flake8-use-pathlib

flake8-use-pathlib

library0.3.0pypypiunverified

flake8-use-pathlib is a plugin for the Flake8 linter that identifies patterns in Python code where functions from the `os.path` module (and other `os` functions) can be replaced by a more modern, object-oriented approach using the `pathlib` module. It helps developers write cleaner, more consistent, and cross-platform compatible code for file system operations. The current version is 0.3.0, released in August 2022, and it is actively maintained, with its rules also integrated into linters like Ruff.

testing devops

pip install flake8-use-pathlib

package ↗homepage ↗

INSTALL

IMPORT

SIG · FLAKE8-USE-PATHLIB

flake8-use-pathlib

testingpythonv0.3.0

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

After installation, `flake8-use-pathlib` automatically integrates with `flake8`. Simply run `flake8` on your Python files or project, and it will report issues where `os.path` functions can be replaced with `pathlib` equivalents, using 'PL' error codes.

# 1. Install flake8-use-pathlib (if you haven't already) # pip install flake8 flake8-use-pathlib # 2. Create a Python file, e.g., my_app.py, with some os.path usage: # import os # # def get_absolute_path(filename): # return os.path.abspath(filename) # # def list_directory(path): # return os.listdir(path) # # print(get_absolute_path('file.txt')) # print(list_directory('.')) # 3. Run flake8 from your terminal in the directory containing my_app.py: # flake8 my_app.py # Expected output (or similar, depending on flake8 version and other plugins): # my_app.py:4:12: PL100 os.path.abspath("filename") should be replaced by filename_path.resolve() (os-path-abspath) # my_app.py:7:12: PL208 os.listdir(path) should be replaced by path_obj.iterdir() (os-listdir)

Debug

Known issues

breakingThe package was previously named `flake8-pathlib`. Users should ensure they are installing `flake8-use-pathlib` as the former name is deprecated and no longer updated.

fix

Use `pip install flake8-use-pathlib` instead of `pip install flake8-pathlib`.

affects: <0.3.0 (for `flake8-pathlib` name)

gotchaWhile `pathlib` generally improves code, converting `Path` objects to `str` too early, e.g., `open(str(my_path))`, negates `pathlib`'s benefits. Python's `open()` (since 3.6) and most modern libraries natively accept `Path` objects.

fix

Pass `Path` objects directly to functions that accept them (e.g., `open(my_path)`). Only convert to `str` if a function strictly requires it and does not support `os.PathLike` objects.

affects: All versions

gotchaSome autofixes derived from `flake8-use-pathlib` rules (e.g., for `os.path.expanduser` to `Path.expanduser`) are considered 'unsafe' because `os.path` and `pathlib.Path` methods can have subtly different behaviors (e.g., error handling) or return types.

fix

Always review and test code after applying autofixes, especially those marked as potentially unsafe, to ensure functionality is preserved.

affects: All versions with autofix support (e.g., via Ruff)

gotchaUsing `pathlib` can sometimes be less performant than lower-level `os` module alternatives, especially on older Python versions or in performance-critical sections of code.

fix

For highly performance-sensitive operations, consider benchmarking `pathlib` against `os` module functions. For most typical file operations, `pathlib`'s benefits in readability and maintainability outweigh minor performance differences.

affects: All versions, more pronounced on Python <3.8

gotchaFlake8's configuration file discovery changed in version 5.0.0. Configuration in `~/.flake8` is explicitly ignored for global settings.

fix

Ensure project-specific configurations are placed in `setup.cfg`, `tox.ini`, or `.flake8` within the project root, rather than relying on global `~/.flake8` settings for `flake8-use-pathlib` rules.

affects: Flake8 >=5.0.0

Errors

Common errors & fixes

ModuleNotFoundError: No module named 'flake8_use_pathlib'

The `flake8-use-pathlib` plugin is not installed in the Python environment where Flake8 is being run.

fix

Install the plugin using pip: `pip install flake8-use-pathlib`

AttributeError: partially initialized module 'pathlib' has no attribute 'Path' (most likely due to a circular import)

You have a Python file named `pathlib.py` in your project or Python path, which shadows the standard library's `pathlib` module, leading to an import conflict.

fix

Rename your local `pathlib.py` file to something else to avoid conflicting with the built-in `pathlib` module.

PL100 os.path.abspath('foo') should be replaced by foo_path.resolve()

This is a linting message from `flake8-use-pathlib` (or Ruff's `PTH100` rule) indicating that an `os.path.abspath()` call can be refactored to use `pathlib.Path.resolve()` for a more modern and object-oriented approach.

fix

Replace `os.path.abspath('foo')` with `Path('foo').resolve()` after importing `Path` from `pathlib`.

AttributeError: 'module' object has no attribute 'normalize_paths'

This error typically occurs due to an incompatibility or conflict between an older version of Flake8 and a newer version of its dependency, `pycodestyle` (formerly `pep8`), or a broken installation.

fix

Upgrade your Flake8 installation to a recent version: `pip install --upgrade flake8` and ensure `pycodestyle` is also up-to-date: `pip install --upgrade pycodestyle`.

Upgrade

Version history

0.3.0latest on PyPI · released Aug 14, 2022

Audit

Dependencies

flake8requiredThis is a plugin for Flake8 and requires Flake8 to be installed to function.

Agent activity

2 hits · last 30 days

node

Resources

packagehttps://pypi.org/project/flake8-use-pathlib/ ↗

homepagehttps://gitlab.com/RoPP/flake8-use-pathlib ↗