Running brew doctor shows I have 3 different python "config" scripts installed. How do I get rid of them so that I no longer receive this warning?
Those scripts refer to an official Apple installation of Python. You can uninstall those safely this way:


Open "Applications" in Mac Finder and drag Python to the trash bin.
Empty the trash bin


Note: 


the MacOS system Python is /usr/bin/python
Homebrew Python(s) will be located in /usr/local/bin/
Pythons installed as an Apple application live in /Library/Frameworks/Python.framework/