Check format by black

.github/PULL_REQUEST_TEMPLATE.md

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+
+<!-- 
+Please format codes by black before pull request.
+
+For example:
+    $ pip install -r ./requirements_dev.txt
+    $ make style
+
+To test:
+    $ make test
+-->

.github/workflows/ci.yml

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+---
+name: CI
+on:
+  push:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+
+jobs:
+  ci:
+    strategy:
+      matrix:
+        python-version: ["3.11"]
+        os: [ubuntu-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Create venv
+        run: |
+          python3 -m venv .venv
+
+      - name: Load cached venv
+        id: cached-poetry-dependencies
+        uses: actions/cache@v3
+        with:
+          path: .venv
+          key: venv-${{ runner.os }}-${{ matrix.python-version }}-${{ hashFiles('requirements_dev.txt') }}
+
+      - name: Install dependencies
+        run: .venv/bin/pip install -r ./requirements_dev.txt
+
+      - name: Test
+        run: |
+          . .venv/bin/activate
+          make test

Makefile

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+.PHONY: all
+all:
+
+.PHONY: style
+style: 
+	black --exclude venv --exclude .venv .
+
+.PHONY: test_style
+test_style:
+	find . -type d \( -name venv -o -name .venv \) -prune -o -type f -name "*.py" -print | xargs black --diff | diff /dev/null -
+
+.PHONY: test
+test: test_style
+
+
+.DELETE_ON_ERROR:
+SHELL=/bin/bash

requirements_dev.txt

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+black==23.10.1