Replace black with ruff in the contributing guides

CORE_TEAM_GUIDE.md

@@ -271,8 +271,7 @@ resources such as:
    [NumPy documentation guide](https://numpy.org/devdocs/dev/howto-docs.html#documentation-style)
    for docstring conventions.
 - [`pre-commit`](https://pre-commit.com) hooks for autoformatting.
-- [`black`](https://github.com/psf/black) autoformatting.
-- [`flake8`](https://github.com/PyCQA/flake8) linting.
+- [`ruff`](https://github.com/astral-sh/ruff) autoformatting and linting.
 - [python-xarray](https://stackoverflow.com/questions/tagged/python-xarray) on Stack Overflow.
 - [@xarray_dev](https://twitter.com/xarray_dev) on Twitter.
 - [xarray-dev](https://discord.gg/bsSGdwBn) discord community (normally only used for remote synchronous chat during sprints).

ci/min_deps_check.py

@@ -17,7 +17,6 @@
 
 CHANNELS = ["conda-forge", "defaults"]
 IGNORE_DEPS = {
-    "black",
     "coveralls",
     "flake8",
     "hypothesis",

ci/requirements/all-but-dask.yml

@@ -3,7 +3,6 @@ channels:
   - conda-forge
   - nodefaults
 dependencies:
-  - black
   - aiobotocore
   - array-api-strict
   - boto3

doc/contributing.rst

@@ -549,11 +549,7 @@ Code Formatting
 
 xarray uses several tools to ensure a consistent code format throughout the project:
 
-- `Black <https://black.readthedocs.io/en/stable/>`_ for standardized
-  code formatting,
-- `blackdoc <https://blackdoc.readthedocs.io/en/stable/>`_ for
-  standardized code formatting in documentation,
-- `ruff <https://github.com/charliermarsh/ruff/>`_ for code quality checks and standardized order in imports
+- `ruff <https://github.com/charliermarsh/ruff/>`_ for formatting, code quality checks and standardized order in imports
 - `absolufy-imports <https://github.com/MarcoGorelli/absolufy-imports>`_ for absolute instead of relative imports from different files,
 - `mypy <http://mypy-lang.org/>`_ for static type checking on `type hints
   <https://docs.python.org/3/library/typing.html>`_.
@@ -1069,7 +1065,7 @@ PR checklist
   - Test the code using `Pytest <http://doc.pytest.org/en/latest/>`_. Running all tests (type ``pytest`` in the root directory) takes a while, so feel free to only run the tests you think are needed based on your PR (example: ``pytest xarray/tests/test_dataarray.py``). CI will catch any failing tests.
   - By default, the upstream dev CI is disabled on pull request and push events. You can override this behavior per commit by adding a ``[test-upstream]`` tag to the first line of the commit message. For documentation-only commits, you can skip the CI per commit by adding a ``[skip-ci]`` tag to the first line of the commit message.
 
-- **Properly format your code** and verify that it passes the formatting guidelines set by `Black <https://black.readthedocs.io/en/stable/>`_ and `Flake8 <http://flake8.pycqa.org/en/latest/>`_. See `"Code formatting" <https://docs.xarray.dev/en/stablcontributing.html#code-formatting>`_. You can use `pre-commit <https://pre-commit.com/>`_ to run these automatically on each commit.
+- **Properly format your code** and verify that it passes the formatting guidelines set by `ruff <https://github.com/astral-sh/ruff>`_. See `"Code formatting" <https://docs.xarray.dev/en/stablcontributing.html#code-formatting>`_. You can use `pre-commit <https://pre-commit.com/>`_ to run these automatically on each commit.
 
   - Run ``pre-commit run --all-files`` in the root directory. This may modify some files. Confirm and commit any formatting changes.
 

pyproject.toml

@@ -244,14 +244,13 @@ docstring-code-format = true
 
 [tool.ruff.lint]
 # E402: module level import not at top of file
-# E501: line too long - let black worry about that
+# E501: line too long - let the formatter worry about that
 # E731: do not assign a lambda expression, use a def
 extend-safe-fixes = [
   "TID252", # absolute imports
 ]
 ignore = [
   "E402",
-  "E501",
   "E731",
   "UP007",
 ]