Add automated code formatter

.github/workflows/autopep8.yml

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+name: Format python code with autopep8
+on: push
+jobs:
+  autopep8:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: autopep8
+        id: autopep8
+        uses: peter-evans/autopep8@v2
+        with:
+          args: --exit-code --max-line-length 120 --recursive --in-place --aggressive --aggressive .
+      - name: Get Pull Request Number
+        id: pr
+        run: echo "::set-output name=pull_request_number::$(gh pr view --json number -q .number || echo "")"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Find Comment
+        uses: peter-evans/find-comment@v2
+        id: fc
+        with:
+          issue-number: ${{ steps.pr.outputs.pull_request_number }}
+          comment-author: "github-actions[bot]"
+      - name: Create comment if autopep8 made NO changes
+        if: ${{ steps.fc.outputs.comment-id == '' && steps.autopep8.outputs.exit-code != 2}}
+        uses: peter-evans/create-or-update-comment@v3
+        with:
+          issue-number: ${{ steps.pr.outputs.pull_request_number }}
+          body: |
+            Code has no PEP8 errors!
+      - name: Create comment if autopep8 made changes
+        if: ${{ steps.fc.outputs.comment-id == '' && steps.autopep8.outputs.exit-code == 2}}
+        uses: peter-evans/create-or-update-comment@v3
+        with:
+          issue-number: ${{ steps.pr.outputs.pull_request_number }}
+          body: |
+            Code in this pull request contains PEP8 errors, please write the `/fix-pep8` command in the comments below to create commit with automatic fixes.
+      - name: Update comment if NOT fixed
+        if: ${{ steps.fc.outputs.comment-id != '' && steps.autopep8.outputs.exit-code == 2}}
+        uses: peter-evans/create-or-update-comment@v3
+        with:
+          comment-id: ${{ steps.fc.outputs.comment-id }}
+          edit-mode: replace
+          body: |
+            Code in this pull request **still** contains PEP8 errors, please write the `/fix-pep8` command in the comments below to create commit with automatic fixes.
+
+            ##### Comment last updated at ${{ github.event.head_commit.timestamp }}
+      - name: Update comment if fixed
+        if: ${{ steps.fc.outputs.comment-id != '' && steps.autopep8.outputs.exit-code != 2}}
+        uses: peter-evans/create-or-update-comment@v3
+        with:
+          comment-id: ${{ steps.fc.outputs.comment-id }}
+          edit-mode: replace
+          body: |
+            All PEP8 errors has been fixed, thanks :heart:
+
+            ##### Comment last updated at ${{ github.event.head_commit.timestamp }}
+      - name: Fail if autopep8 made changes
+        if: steps.autopep8.outputs.exit-code == 2
+        run: exit 1

.github/workflows/fix-pep8-command.yml

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+name: fix-pep8-command
+on:
+  repository_dispatch:
+    types: [fix-pep8-command]
+jobs:
+  fix-pep8:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.REPO_ACCESS_TOKEN }}
+          repository: ${{ github.event.client_payload.pull_request.head.repo.full_name }}
+          ref: ${{ github.event.client_payload.pull_request.head.ref }}
+      - name: autopep8
+        id: autopep8
+        uses: peter-evans/autopep8@v2
+        with:
+          args: --exit-code --max-line-length 120 --recursive --in-place --aggressive --aggressive .
+      - name: Commit autopep8 changes
+        id: cap8c
+        if: steps.autopep8.outputs.exit-code == 2
+        run: |
+          git config --global user.name 'github-actions[bot]'
+          git config --global user.email 'github-actions[bot]@users.noreply.github.com'
+          git commit -am "Automated autopep8 fixes"
+          git push
+      - name: Create comment
+        if: steps.cap8c.outcome == 'success'
+        uses: peter-evans/create-or-update-comment@v3
+        with:
+          repository: ${{ github.event.client_payload.github.payload.repository.full_name }}
+          issue-number: ${{ github.event.client_payload.github.payload.issue.number }}
+          body: |
+            Fixed PEP8 problems!

.github/workflows/slash-command-dispatch.yml

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+name: Slash Command Dispatch
+on:
+  issue_comment:
+    types: [created]
+jobs:
+  slashCommandDispatch:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Slash Command Dispatch
+        uses: peter-evans/slash-command-dispatch@v3
+        with:
+          token: ${{ secrets.REPO_ACCESS_TOKEN }}
+          reactions: true
+          commands: fix-pep8
+          issue-type: pull-request