Add code python-syntax-checker and other github actions

.github/workflows/codeql-analysis.yml

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+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master ]
+  schedule:
+    - cron: '39 8 * * 0'
+
+jobs:
+  analyze:
+    permissions: write-all
+    name: Analyze
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'python' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
+        # Learn more:
+        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1

.github/workflows/python-syntax-checker.yml

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+# from https://docs.github.com/en/actions/guides/building-and-testing-python
+
+name: Python syntax checker
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        # version range and latest minor release (possibly 3.9.1)
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.x']
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install flake8
+        # next line is alternative to the previous one, for future use of pytest
+        # pip install flake8 pytest
+        # next line is for future use of requirements file
+        # if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+    - name: Lint with flake8
+      run: |
+        # stop the build if there are Python syntax errors or undefined names
+        flake8 . --count --select=E9,F63,F7,F72,F82 --show-source --statistics
+        # next lines is for future use of more accurate statistics
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        # flake8 . --count --exit-zero --max-complexity=40 --max-line-length=127 --statistics
+    # next lines is for future use of pytest
+    #- name: Test with pytest
+    #  run: |
+    #    pytest

.github/workflows/stale.yml

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+name: Mark stale issues and automatically close them
+
+on:
+  schedule:
+  - cron: '00 23 * * *'
+
+jobs:
+  stale:
+
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+
+    steps:
+    - uses: actions/stale@v4  # https://github.com/actions/stale
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        stale-issue-message: 'This issue becomed stale because of no feedback for 30 days. Remove the stale label or add a comment; otherwise, this will be automatically closed in 60 days.'
+        stale-pr-message: 'This PR becomed stale because of no feedback for 60 days.'
+        days-before-stale: 30
+        days-before-close: 60
+        close-issue-message: 'This issue was closed because it has been stalled for 60 days with no activity.'
+        days-before-pr-close: -1
+        any-of-labels: answered,needs-rebase,inactive,Awaiting-Response,question,invalid,duplicate,wontfix
+        exempt-all-pr-assignees: true