I use pipx for this. It isolates each tool in its own virtualenv. You might still have to install a specific Python version (although the latest 3.X works fine for me), but it takes some of the pain out of the process and makes sure you don't pollute your global/system install.

On a Mac, it could be as simple as (assuming you already use Homebrew):

    brew install python
    brew install pipx
    pipx ensurepath # adds ~/.local/bin to $PATH
    pipx install <tool>
    <tool>