Add autopep8 github action

Author: cscarpitta

.github/workflows/autopep8.yml

@@ -0,0 +1,42 @@
+name: autopep8
+on: pull_request
+jobs:
+  autopep8:
+    # Check if the PR is not raised by this workflow and is not from a fork
+    if: startsWith(github.head_ref, 'autopep8-patches') == false && github.event.pull_request.head.repo.full_name == github.repository
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Python 3
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3
+      - name: Checkout Code
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ github.head_ref }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install setuptools wheel flake8 pytest
+      - name: autopep8
+        id: autopep8
+        uses: peter-evans/autopep8@v1
+        with:
+          args: --exit-code --recursive --in-place --aggressive --aggressive .
+      - name: Set autopep8 branch name
+        id: vars
+        run: echo ::set-output name=branch-name::"autopep8-patches/$GITHUB_HEAD_REF"
+      - name: Create Pull Request
+        if: steps.autopep8.outputs.exit-code == 2
+        uses: peter-evans/create-pull-request@v2
+        with:
+          commit-message: autopep8 action fixes
+          committer: Carmine Scarpitta <[email protected]>
+          title: Fixes by autopep8 action
+          body: This is an auto-generated PR with fixes by autopep8.
+          labels: autopep8, automated pr
+          reviewers: cscarpitta
+          branch: ${{ steps.vars.outputs.branch-name }}
+      - name: Fail if autopep8 made changes
+        if: steps.autopep8.outputs.exit-code == 2
+        run: exit 1