Add config and CI for formatting with yapf.

.github/workflows/main.yml

@@ -20,10 +20,13 @@ jobs:
     - name: install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install flake8 pytest
+        pip install flake8 pytest yapf
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: lint with flake8
       run: flake8 . --exit-zero
+    - name: formatting with yapf
+      continue-on-error: true
+      run: yapf -r -d .
     - name: test with pytest
       run: pytest
 

setup.cfg

@@ -42,3 +42,9 @@ max-complexity = 15
 max-line-length = 140
 show-source = True
 statistics = True
+
+[yapf]
+based_on_style = pep8
+split_before_arithmetic_operator = true
+split_before_bitwise_operator = true
+split_before_logical_operator = true