Introducing ruff as a linter to replace pylint, flake8 and isort

.pre-commit-config.yaml

@@ -19,27 +19,57 @@ repos:
             exclude: "^kedro/templates/|^features/steps/test_starter/"
           - id: requirements-txt-fixer # Sorts entries in requirements.txt
             exclude: "^kedro/templates/|^features/steps/test_starter/"
+
+    - repo: https://github.com/pre-commit/mirrors-mypy
+      rev: v0.961
+      hooks:
+          - id: mypy
+            args: [--allow-redefinition, --ignore-missing-imports]
+            exclude: |
+                (?x)(
+                  ^kedro/templates/|
+                  ^docs/|
+                  ^features/steps/test_starter/
+                )
+            additional_dependencies:
+            - types-cachetools
+            - types-filelock
+            - types-PyYAML
+            - types-redis
+            - types-requests
+            - types-setuptools
+            - types-toml
+            - attrs
+
     - repo: https://github.com/asottile/blacken-docs
       rev: v1.12.1
       hooks:
           - id: blacken-docs
             additional_dependencies: [black~=22.0]
             entry: blacken-docs --skip-errors
 
-    - repo: https://github.com/asottile/pyupgrade
-      rev: v2.26.0
+    - repo: https://github.com/astral-sh/ruff-pre-commit
+      # Ruff version.
+      rev: v0.0.270
+      hooks:
+        - id: ruff
+          name: "ruff on kedro/"
+          args: ["--fix", "--show-fixes", "--exit-non-zero-on-fix"]
+          exclude: "^kedro/templates/|^features/steps/test_starter/|tests|docs"
+    - repo: https://github.com/astral-sh/ruff-pre-commit
+      # Ruff version.
+      rev: v0.0.270
       hooks:
-          - id: pyupgrade
-            args: [--py36-plus]
+        - id: ruff
+          name: "ruff on tests/ and docs/"
+          # PLR2004: Magic value used
+          # PLR0913: Too many arguments
+          args: ["--fix", "--show-fixes", "--exit-non-zero-on-fix", "--ignore=PLR2004,PLR0913"]
+          # include: "tests"
+          exclude: "^kedro/templates/|^features/steps/test_starter/|kedro"
 
     - repo: local
       hooks:
-          - id: isort
-            name: "Sort imports"
-            language: system
-            types: [file, python]
-            exclude: ^kedro/templates/|^features/steps/test_starter
-            entry: isort
           - id: black
             name: "Black"
             language: system
@@ -53,65 +83,6 @@ repos:
             pass_filenames: false
             entry: lint-imports
 
-
-          # It's impossible to specify per-directory configuration, so we just run it many times.
-          # https://github.com/PyCQA/pylint/issues/618
-          # The first set of pylint checks if for local pre-commit, it only runs on the files changed.
-          - id: pylint-quick-kedro
-            name: "Quick Pylint on kedro/*"
-            language: system
-            types: [file, python]
-            files: ^kedro/
-            exclude: ^kedro/templates/
-            entry: pylint -j 4 --disable=unnecessary-pass
-            stages: [commit]
-          - id: pylint-quick-tests
-            name: "Quick Pylint on tests/*"
-            language: system
-            types: [file, python]
-            files: ^tests/
-            entry: pylint -j 4 --disable=missing-docstring,redefined-outer-name,no-self-use,invalid-name,protected-access,too-many-arguments,too-many-public-methods
-            stages: [commit]
-          - id: pylint-quick-features
-            name: "Quick Pylint on features/*"
-            language: system
-            types: [file, python]
-            files: ^features/
-            exclude: ^features/steps/test_starter
-            entry: pylint -j 4 --disable=missing-docstring,no-name-in-module
-            stages: [commit]
-
-          # The same pylint checks, but running on all files. It's for manual run with `make lint`
-          - id: pylint-kedro
-            name: "Pylint on kedro/*"
-            language: system
-            pass_filenames: false
-            stages: [manual]
-            entry: pylint -j 4 --disable=unnecessary-pass --init-hook="import sys; sys.setrecursionlimit(2000)" kedro
-          - id: pylint-tests
-            name: "Pylint on tests/*"
-            language: system
-            pass_filenames: false
-            stages: [manual]
-            entry: pylint -j 4 --disable=missing-docstring,redefined-outer-name,no-self-use,invalid-name,protected-access,too-many-arguments,too-many-public-methods,use-implicit-booleaness-not-comparison tests
-          - id: pylint-features
-            name: "Pylint on features/*"
-            language: system
-            pass_filenames: false
-            stages: [manual]
-            exclude: ^features/steps/test_starter
-            entry: pylint -j 4 --disable=missing-docstring,no-name-in-module features
-    - repo: https://github.com/pre-commit/pre-commit-hooks
-      rev: v2.2.3
-      hooks:
-          - id: flake8
-            args:
-            - "--max-line-length=88"
-            - "--max-complexity=18"
-            - "--max-complexity=18"
-            - "--select=B,C,E,F,W,T4,B9"
-            - "--ignore=E203,E266,E501,W503"
-            exclude: "^kedro/templates/|^features/steps/test_starter/"
     - repo: https://github.com/pre-commit/mirrors-mypy
       rev: v0.961
       hooks:
@@ -147,3 +118,5 @@ repos:
             types: [file, python]
             exclude: ^kedro/templates/|^tests/|^features/steps/test_starter
             entry: bandit -ll
+
+# Manual only

Makefile

@@ -12,7 +12,6 @@ install-pip-setuptools:
 
 lint:
 	pre-commit run -a --hook-stage manual $(hook)
-
 test:
 	pytest --numprocesses 4 --dist loadfile
 

RELEASE.md

@@ -18,6 +18,7 @@
 * Consolidated dependencies and optional dependencies in `pyproject.toml`.
 
 ## Documentation changes
+- Recommended `ruff` as the linter and remove mentions of `pylint`, `isort`, `flake8`.
 
 ## Breaking changes to the API
 

docs/source/conf.py

@@ -499,8 +499,7 @@ def _add_jinja_filters(app):
     # LaTeXBuilder is used in the PDF docs build,
     # and it doesn't have attribute 'templates'
     if not (
-        isinstance(app.builder, LaTeXBuilder)
-        or isinstance(app.builder, CheckExternalLinksBuilder)
+        isinstance(app.builder, (LaTeXBuilder,CheckExternalLinksBuilder))
     ):
         app.builder.templates.environment.filters["env_override"] = env_override
 

docs/source/contribution/developer_contributor_guidelines.md

@@ -131,7 +131,7 @@ We will work with you to complete your contribution, but we reserve the right to
        ```
 
 Ensure that your PR builds cleanly before you submit it, by running the CI/CD checks locally, as follows:
-* `make lint`: PEP-8 Standards (`pylint`, `flake8`)
+* `make lint`: PEP-8 Standards (`ruff`, `black`)
 * `make test`: unit tests, 100% coverage (`pytest`, `pytest-cov`)
 * `make e2e-tests`: end-to-end tests (`behave`)
 

docs/source/development/commands_reference.md

@@ -402,7 +402,7 @@ The `build-docs` command builds [project documentation](../tutorial/package_a_pr
 #### Lint your project
 
 ```{note}
-_This command will be deprecated from Kedro version 0.19.0._
+_This command will be deprecated from Kedro version 0.19.0._. We still recommend to (../development/linting.md) and you can find more help here
 ```
 
 ```bash

docs/source/development/linting.md

@@ -10,25 +10,23 @@ As a project grows and goes through various stages of development it becomes imp
 
 ## Set up Python tools
 There are a variety of Python tools available to use with your Kedro projects. This guide shows you how to use
-[`black`](https://github.com/psf/black), [`flake8`](https://github.com/PyCQA/flake8), and
-[`isort`](https://github.com/PyCQA/isort) to format and lint your Kedro projects.
+[`black`](https://github.com/psf/black), [`ruff`](https://beta.ruff.rs).
 - **`black`** is a [PEP 8](https://peps.python.org/pep-0008/) compliant opinionated Python code formatter. `black` can
 check for styling inconsistencies and reformat your files in place.
 [You can read more in the `black` documentation](https://black.readthedocs.io/en/stable/).
-- **`flake8`** is a wrapper around [`pep8`](https://pypi.org/project/pep8/),
-[`pyflakes`](https://pypi.org/project/pyflakes/), and [`mccabe`](https://pypi.org/project/mccabe/) which can lint code and format it with respect to [PEP 8](https://peps.python.org/pep-0008/),
-and check the [cyclomatic complexity](https://www.ibm.com/docs/en/raa/6.1?topic=metrics-cyclomatic-complexity) of your code base.
-[You can read more in the `flake8` documentation](https://flake8.pycqa.org/en/latest/).
-- **`isort`** is a Python library used to reformat code by sorting imports alphabetically and automatically separating them into sections by
+- **`ruff`** is a fast linter that replaces `flake8`, `pylint`, `pyupgrade`, `isort` and [more](https://beta.ruff.rs/docs/rules/).
+  - It helps to make your code compliant to [`pep8`](https://pypi.org/project/pep8/).
+  - It reformats code by sorting imports alphabetically and automatically separating them into sections by
 type. [You can read more in the `isort` documentation](https://pycqa.github.io/isort/).
 
+
 ### Install the tools
-Install `black`, `flake8`, and `isort` by adding the following lines to your project's `src/requirements.txt`
+Install `black` and `ruff` by adding the following lines to your project's `src/requirements.txt`
 file:
 ```text
 black # Used for formatting code
-flake8 # Used for linting and formatting
-isort # Used for formatting code (sorting module imports)
+ruff # Used for linting, formatting and sorting module imports
+
 ```
 To install all the project-specific dependencies, including the linting tools, navigate to the root directory of the
 project and run:
@@ -37,10 +35,29 @@ pip install -r src/requirements.txt
 ```
 Alternatively, you can individually install the linting tools using the following shell commands:
 ```bash
-pip install black
-pip install flake8
-pip install isort
+pip install black ruff
 ```
+#### Configure `ruff`
+`ruff` read configurations from `pyproject.toml` within your project root. You can enable different rule sets within the `[tool.ruff]` section. For example, the rule set `F` is equivalent to `Pyflakes`.
+
+To start with `ruff`, we recommend adding this section to enable a few basic rules sets.
+```toml
+[tool.ruff]
+select = [
+    "F",  # Pyflakes
+    "E",  # Pycodestyle
+    "W",  # Pycodestyle
+    "UP",  # pyupgrade
+    "I",  # isort
+    "PL", # Pylint
+]
+ignore = ["E501"]  # Black take care off line-too-long
+```
+
+```{note}
+It is a good practice to [split your line when it is too long](https://beta.ruff.rs/docs/rules/line-too-long/), so it can be read easily even in a small screen. `ruff` treats this slightly different from `black`, when using together we recommend to disable this rule, i.e. `E501` to avoid conflicts.
+```
+
 #### Configure `flake8`
 
 Store your `flake8` configuration in a file named `setup.cfg` within your project root. The Kedro starters use the [following configuration](https://github.com/kedro-org/kedro-starters/blob/main/pandas-iris/%7B%7B%20cookiecutter.repo_name%20%7D%7D/setup.cfg):
@@ -87,17 +104,11 @@ you want to run before each `commit`.
 Below is a sample `YAML` file with entries for `black`,`flake8`, and `isort`:
 ```yaml
 repos:
-  - repo: https://github.com/pycqa/isort
-    rev: 5.10.1
-    hooks:
-      - id: isort
-        name: isort (python)
-        args: ["--profile", "black"]
-
-  - repo: https://github.com/pycqa/flake8
-    rev: ''  # pick a git hash / tag to point to
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    # Ruff version.
+    rev: v0.0.270
     hooks:
-      - id: flake8
+      - id: ruff
 
   - repo: https://github.com/psf/black
     rev: 22.8.0

docs/source/kedro_project_setup/starters.md

@@ -155,7 +155,7 @@ Here is the layout of the project as a Cookiecutter template:
 ├── docs                         # Project documentation
 ├── notebooks                    # Project related Jupyter notebooks (can be used for experimental code before moving the code to src)
 ├── README.md                    # Project README
-├── setup.cfg                    # Configuration options for tools e.g. `pytest` or `flake8`
+├── setup.cfg                    # Configuration options for tools e.g. `pytest` or `black`
 └── src                          # Project source code
     └── {{ cookiecutter.python_package }}
        ├── __init.py__

features/environment.py

@@ -1,5 +1,5 @@
 """Behave environment setup commands."""
-# pylint: disable=unused-argument
+# noqa: unused-argument
 from __future__ import annotations
 
 import os

features/steps/cli_steps.py

@@ -229,7 +229,7 @@ def add_test_jupyter_nb(context):
     """Create a test jupyter notebook using TEST_JUPYTER_ORG."""
     with open(
         str(context.root_project_dir / "notebooks" / "hello_world.ipynb"),
-        "wt",
+        "w",
         encoding="utf-8",
     ) as test_nb_fh:
         test_nb_fh.write(TEST_JUPYTER_ORG)
@@ -366,7 +366,7 @@ def simulate_nb_execution(context):
     """
     with open(
         str(context.root_project_dir / "notebooks" / "hello_world.ipynb"),
-        "wt",
+        "w",
         encoding="utf-8",
     ) as test_nb_fh:
         test_nb_fh.write(TEST_JUPYTER_AFTER_EXEC)
@@ -554,7 +554,7 @@ def check_additional_cell_added(context):
         encoding="utf-8",
     ) as test_nb_fh:
         context.nb_data = json.load(test_nb_fh)
-        assert len(context.nb_data["cells"]) == 2
+        assert len(context.nb_data["cells"]) == 2  # noqa: PLR2004
 
 
 @then("the output should be empty in all the cells in the jupyter notebook")

features/steps/sh_run.py

@@ -37,9 +37,7 @@ def run(
     if isinstance(cmd, str) and split:
         cmd = shlex.split(cmd)
     # pylint: disable=subprocess-run-check
-    result = subprocess.run(
-        cmd, input="", stdout=subprocess.PIPE, stderr=subprocess.PIPE, **kwargs
-    )
+    result = subprocess.run(cmd, input="", capture_output=True, **kwargs)
     result.stdout = result.stdout.decode("utf-8")
     result.stderr = result.stderr.decode("utf-8")
     if print_output:

features/steps/test_plugin/plugin.py

@@ -11,9 +11,7 @@
 
 class MyPluginHook:
     @hook_impl
-    def after_catalog_created(
-        self, catalog
-    ):  # pylint: disable=unused-argument, no-self-use
+    def after_catalog_created(self, catalog):  # noqa: unused-argument, no-self-use
         logger.info("Reached after_catalog_created hook")
 
 

features/steps/test_starter/{{ cookiecutter.repo_name }}/src/{{ cookiecutter.python_package }}/pipelines/data_science/nodes.py

@@ -3,7 +3,7 @@
 
 Delete this when you start working on your own Kedro project.
 """
-# pylint: disable=invalid-name
+# noqa: invalid-name
 from __future__ import annotations
 
 import logging

kedro/config/common.py

@@ -124,7 +124,7 @@ def _load_config_file(
         Parsed configuration.
     """
     # for performance reasons
-    import anyconfig  # pylint: disable=import-outside-toplevel
+    import anyconfig  # noqa: import-outside-toplevel
 
     try:
         # Default to UTF-8, which is Python 3 default encoding, to decode the file
@@ -230,7 +230,7 @@ def _check_duplicate_keys(
 
         if overlapping_keys:
             sorted_keys = ", ".join(sorted(overlapping_keys))
-            if len(sorted_keys) > 100:
+            if len(sorted_keys) > 100:  # noqa: PLR2004
                 sorted_keys = sorted_keys[:100] + "..."
             duplicates.append(f"{processed_file}: {sorted_keys}")
 

kedro/config/config.py

@@ -66,7 +66,7 @@ class ConfigLoader(AbstractConfigLoader):
 
     """
 
-    def __init__(
+    def __init__(  # noqa: too-many-arguments
         self,
         conf_source: str,
         env: str = None,