Use pre-commit for checks, and add isort and black

Author: stefanv

.github/workflows/python-app.yml

@@ -0,0 +1,31 @@
+name: test
+
+on: [push, pull_request]
+
+jobs:
+  default:
+    runs-on: ${{ matrix.os }}-latest
+    strategy:
+      matrix:
+        os: [ubuntu]
+        python-version: [3.10]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install flake8 pytest
+        pip install -r requirements.txt -r requirements.dev.txt
+
+    - name: Lint
+      run: pre-commit run --all-files --show-diff-on-failure --color always
+
+    - name: Test
+      run: |
+        PYTHONPATH=. pytest

.github/workflows/test.yaml

@@ -0,0 +1,17 @@
+# Install pre-commit hooks via
+# pre-commit install
+
+repos:
+  - repo: https://github.com/psf/black
+    rev: 21.5b1
+    hooks:
+    - id: black
+  - repo: https://gitlab.com/pycqa/flake8
+    rev: 3.8.4
+    hooks:
+      - id: flake8
+        pass_filenames: true
+  - repo: https://github.com/pycqa/isort
+    rev: 5.10.1
+    hooks:
+      - id: isort

.pre-commit-config.yaml

@@ -0,0 +1,2 @@
+black==21.5b1
+pre-commit>=2.12