name: Publish Python Package
on:
  push:
    # Sequence of patterns matched against refs/tags
    tags:
      - '*'

permissions:
  contents: read

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v1
    - name: Set up Python
      uses: actions/setup-python@v1
      with:
        python-version: '3.x'
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        pip install setuptools wheel twine
    - name: Build and publish
      env:
        TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
        TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
      run: |
        python setup.py sdist bdist_wheel
        twine upload dist/*

name: Publish Python Package
on:
  push:
    # Sequence of patterns matched against refs/tags
    tags:
      - '*'

permissions:
  contents: read

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v1
    - name: Set up Python
      uses: actions/setup-python@v1
      with:
        python-version: '3.x'
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        pip install setuptools wheel
    - name: Build
      run: |
        python setup.py sdist bdist_wheel
    - name: Publish
      uses: pypa/gh-action-pypi-publish@master
      with:
        user: __token__
        password: ${{ secrets.PYPI_TOKEN }}

Use token to publish packages to PyPI
Use token to publish packages to PyPI

Switching to use the PyPI token instead of username / password.
