[Python] How to know if a Python package (e.g., ipykernel) is preinstalled on macOS — and...

I'm using macOS and working on a Python project with a virtual environment (venv) in VS Code. At one point, VS Code prompted me to install ipykernel, and I accidentally clicked "Install" — but only later realized that the selected interpreter wasn't my venv. So ipykernel got installed globally (i.e., outside the virtual environment).

Now I'm wondering:

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  Is ipykernel preinstalled as part of macOS's system Python?
  
  
• 
  How can I check if a globally installed package is part of the system or user-installed?
  
  
• 
  Most importantly, is it safe to uninstall such packages globally, or could that break system-level tools?
  

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