title: How to remove packages installed with older versions of Python/Pip?
body: <p>I'm experiencing a issue with my packages, I installed a package with Python 3.7 and the current version of Python in my computer is 3.9. So I can't uninstall or update the given package.</p>
  <pre><code>ζ pip3 install --upgrade youtube-dl
  Requirement already satisfied: youtube-dl in /usr/local/lib/python3.9/site-packages (2021.4.7)
  Collecting youtube-dl
    Downloading youtube_dl-2021.4.26-py2.py3-none-any.whl (1.9 MB)
       |████████████████████████████████| 1.9 MB 551 kB/s
  Installing collected packages: youtube-dl
    Attempting uninstall: youtube-dl
      Found existing installation: youtube-dl 2021.4.7
      Uninstalling youtube-dl-2021.4.7:
        Successfully uninstalled youtube-dl-2021.4.7
  Successfully installed youtube-dl-2021.4.26
  WARNING: You are using pip version 21.0.1; however, version 21.1.1 is available.
  You should consider upgrading via the '/usr/local/opt/python@3.9/bin/python3.9 -m pip install --upgrade pip' command.
  
  ζ youtube-dl --version
  2021.04.01
  
  ζ which pip3
  /usr/local/opt/python@3.9/bin/pip3
  
  ζ which youtube-dl
  /Library/Frameworks/Python.framework/Versions/3.7/bin/youtube-dl
  </code></pre>
  <p>How can</p>