[ci] [python-package] move tool configuration to pyproject.toml (#5872)

.ci/lint-python.sh

 #!/bin/sh
 
-DIR_TO_CHECK=${1}
-
 echo "running flake8"
 flake8 \
-    --ignore=E501,W503 \
-    --exclude=./.nuget,./external_libs,./python-package/build,./python-package/compile \
-    "${DIR_TO_CHECK}" \
+    --config=./python-package/setup.cfg \
+    . \
 || exit -1
 echo "done running flake8"
 
 echo "running pydocstyle"
 pydocstyle \
-    --convention=numpy \
-    --add-ignore=D105 \
-    --match-dir="^(?!^external_libs|test|example).*" \
-    --match="(?!^test_|setup).*\.py" \
-    "${DIR_TO_CHECK}" \
+    --config=./python-package/pyproject.toml \
+    . \
 || exit -1
 echo "done running pydocstyle"
 
 echo "running isort"
 isort \
     --check-only \
-    "${DIR_TO_CHECK}" \
+    --settings-path=./python-package/pyproject.toml \
+    . \
 || exit -1
 echo "done running isort"
 
 echo "running mypy"
 mypy \
-    --ignore-missing-imports \
-    --exclude 'build/' \
-    --exclude 'compile/' \
-    --exclude 'docs/' \
-    --exclude 'examples/' \
-    --exclude 'external_libs/' \
-    --exclude 'tests/' \
-    "${DIR_TO_CHECK}/python-package" \
+    --config-file=./python-package/pyproject.toml \
+    ./python-package \
 || true
 echo "done running mypy"

.ci/test.sh

@@ -78,7 +78,7 @@ if [[ $TASK == "lint" ]]; then
         "r-lintr>=3.0"
     source activate $CONDA_ENV
     echo "Linting Python code"
-    sh ${BUILD_DIRECTORY}/.ci/lint-python.sh ${BUILD_DIRECTORY} || exit -1
+    sh ${BUILD_DIRECTORY}/.ci/lint-python.sh || exit -1
     echo "Linting R code"
     Rscript ${BUILD_DIRECTORY}/.ci/lint_r_code.R ${BUILD_DIRECTORY} || exit -1
     echo "Linting C++ code"

build-python.sh

@@ -189,6 +189,11 @@ create_isolated_source_dir() {
 
     cp -R ./python-package ./lightgbm-python
 
+    # temporarily remove these files until
+    # https://github.com/microsoft/LightGBM/issues/5061 is done
+    rm ./lightgbm-python/pyproject.toml
+    rm ./lightgbm-python/setup.cfg
+
     cp LICENSE ./lightgbm-python/
     cp VERSION.txt ./lightgbm-python/lightgbm/VERSION.txt
 

python-package/README.rst

@@ -259,7 +259,7 @@ To check that a contribution to the package matches its style expectations, run
 
 .. code:: sh
 
-    sh .ci/lint-python.sh .
+    sh .ci/lint-python.sh
 
 .. |License| image:: https://img.shields.io/github/license/microsoft/lightgbm.svg
    :target: https://github.com/microsoft/LightGBM/blob/master/LICENSE

python-package/pyproject.toml

+[tool.isort]
+line_length = 120
+skip_glob = [
+    "external_libs/*",
+    "lightgbm-python/*"
+]
+
+[tool.mypy]
+exclude = 'build/*|compile/*|docs/*|examples/*|external_libs/*|lightgbm-python/*|tests/*'
+ignore_missing_imports = true
+
+[tool.pydocstyle]
+add_ignore = [
+    'D105'
+]
+convention = 'numpy'
+match = '(?!^test_|setup).*\.py'
+match_dir = '^(?!^external_libs|lightgbm-python|test|example).*'

python-package/setup.cfg

+[flake8]
+ignore =
+    # line too long
+    E501,
+    # line break occurred before a binary operator
+    W503
+exclude =
+    ./.nuget,
+    ./external_libs,
+    ./lightgbm-python,
+    ./python-package/build,
+    ./python-package/compile