python -m pip install --upgrade pip

• https://caremad.io/posts/2013/07/setup-vs-requirement/ - setup.py vs requirements.txt - an article by Donald Stufft
  • Easy to understand, well written.
  • found it in https://pip.pypa.io/en/stable/user_guide/#requirements-files
• Changes to the pip dependency resolver in 20.3 - https://pip.pypa.io/en/stable/user_guide/#changes-to-the-pip-dependency-resolver-in-20-3-2020
• https://pip.pypa.io/en/stable/news/ - pip changelog