Make docs/source/conf.py ruff-clean

Remove the unused os import, mark the deliberate mid-file doctest import
with noqa: E402, and apply ruff format so the whole repo passes ruff.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: raffaelemancuso

docs/source/conf.py

@@ -7,37 +7,37 @@
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 # Problems with imports? Could try `export PYTHONPATH=$PYTHONPATH:`pwd`` from root project dir...
-import os
 import sys
 from pathlib import Path
+
 src_path = Path("../../src")
 assert src_path.is_dir()
-assert (src_path/"raffalib").is_dir()
+assert (src_path / "raffalib").is_dir()
 sys.path.insert(0, src_path.resolve())  # Source code dir relative to this file
 
 # -- Project information -----------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#project-information
 
-project = 'raffalib-python'
-copyright = '2026, Raffaele Mancuso'
-author = 'Raffaele Mancuso'
+project = "raffalib-python"
+copyright = "2026, Raffaele Mancuso"
+author = "Raffaele Mancuso"
 
 # -- General configuration ---------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
 
 extensions = [
-    'autoapi.extension',
-    'sphinx.ext.doctest',
+    "autoapi.extension",
+    "sphinx.ext.doctest",
 ]
 
-autoapi_dirs = ['../../src']
+autoapi_dirs = ["../../src"]
 
 # -- doctest configuration ---------------------------------------------------
 # The examples in the narrative docs are executable doctests, run with
 # ``sphinx-build -b doctest`` (``make doctest``). ELLIPSIS lets the
 # non-deterministic ``Took: ...`` timing lines match; NORMALIZE_WHITESPACE makes
 # the DataFrame/table reprs robust to incidental spacing differences.
-import doctest as _doctest
+import doctest as _doctest  # noqa: E402
 
 doctest_default_flags = _doctest.ELLIPSIS | _doctest.NORMALIZE_WHITESPACE
 
@@ -87,9 +87,9 @@ def emit(self, record):
     "special-members",
 ]
 
-exclude_patterns = ['_build', '_templates']
+exclude_patterns = ["_build", "_templates"]
 
 # Add any paths that contain templates here, relative to this directory.
-templates_path = ['_templates']
+templates_path = ["_templates"]
 
 html_theme = "sphinx_rtd_theme"