linter actions

.github/workflows/linter.yml

+name: Linter
+on: [push, pull_request]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    strategy:
+      max-parallel: 4
+      matrix:
+        python-version: [2.7, 3.5, 3.6, 3.7]
+    steps:
+      - uses: actions/checkout
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install flake8
+          flake8 --version
+      - name: Lint
+        run: |
+          flake8 .
+
+      - name: Lint Examples
+        # some examples are py3 only
+        if: matrix.python-version != 2.7
+        run: |
+          cd examples
+          flake8 .
+
+

examples/tox.ini

@@ -4,3 +4,4 @@ ignore = F403,F405,E402,E741,E742,E743,W504,W605
 exclude = private,
           FasterRCNN/utils,
 					__init__.py
+show-source = true

tox.ini

@@ -12,6 +12,7 @@ exclude = .git,
           snippet,
           examples_v2,
           _test.py,
+show-source = true
 
 [isort]
 line_length=100