fix up pre-commit, run in CI

.github/workflows/test.yml

@@ -41,19 +41,8 @@ jobs:
     if: ${{ needs.changes.outputs.changes == 'true' }}
     steps:
     - uses: actions/checkout@v2
-      - name: Set up Python
-        uses: actions/setup-python@v1
-        with:
-          python-version: 3.7
-      - name: Install dependencies
-        run: |
-          python -m pip install -U pip
-          python -m pip install -U black flake8 isort
-      - name: Check the style
-        run: |
-          black -t py36 --check theano/ tests/ setup.py conftest.py
-          isort --check theano/ tests/ setup.py conftest.py
-          flake8
+    - uses: actions/setup-python@v2
+    - uses: pre-commit/action@v2.0.0
 
   test:
     name: "Test py${{ matrix.python-version }}: ${{ matrix.part }}"
@@ -63,7 +52,7 @@ jobs:
     runs-on: ubuntu-latest
     if: ${{ needs.changes.outputs.changes == 'true' && needs.style.result == 'success' }}
     strategy:
-      fail-fast: false
+      fail-fast: true
       matrix:
         python-version: ["3.6", "3.7"]
         fast-compile: [0]

.pre-commit-config.yaml

-repos:
-  - repo: https://github.com/psf/black
-    rev: 20.8b1
-    hooks:
-      - id: black
-        language_version: python3
-        exclude: |
+exclude: |
     (?x)^(
         versioneer\.py|
         theano/_version\.py|
         doc/.*|
         bin/.*
     )$
+repos:
+  - repo: https://github.com/psf/black
+    rev: 20.8b1
+    hooks:
+      - id: black
+        language_version: python3
   - repo: https://gitlab.com/pycqa/flake8
     rev: 3.8.4
     hooks:
       - id: flake8
-        exclude: |
-            (?x)^(
-                versioneer\.py|
-                theano/_version\.py|
-                doc/.*|
-                bin/.*
-            )$
   - repo: https://github.com/pycqa/isort
-    rev: 5.5.2
+    rev: 5.6.4
     hooks:
       - id: isort
-        exclude: |
-            (?x)^(
-                versioneer\.py|
-                theano/_version\.py|
-                doc/.*|
-                bin/.*
-            )$

setup.cfg

@@ -18,6 +18,7 @@ per-file-ignores =
     tests/gpuarray/test_elemwise.py:E402
     tests/gpuarray/test_others.py:E402
     tests/gpuarray/test_basic_ops.py:E402
+    theano/gof/unify.py:F811
 exclude =
     versioneer.py
     doc/