How to fix brew doctor warnings

Question

Im new to messing with the Homebrew package manager please help me learn how to fix my warnings I've noticed it causes problems with python. The warnings are below.

1)Warning: "config" scripts exist outside your system or Homebrew directories. ./configure scripts often look for *-config scripts to determine if software packages are installed, and what additional flags to use when compiling and linking.

Having additional scripts in your path can confuse software installed via Homebrew if the config script overrides a system or Homebrew provided script of the same name. We found the following "config" scripts:
/Library/Frameworks/Python.framework/Versions/3.5/bin/python3-config
/Library/Frameworks/Python.framework/Versions/3.5/bin/python3.5-config /Library/Frameworks/Python.framework/Versions/3.5/bin/python3.5m-config

2)Warning: Python is installed at /Library/Frameworks/Python.framework

Homebrew only supports building against the System-provided Python or a brewed Python. In particular, Pythons installed to /Library can interfere with other software installs.

3)Warning: You have unlinked kegs in your Cellar Leaving kegs unlinked can lead to build-trouble and cause brews that depend on those kegs to fail to run properly once built. Run brew link on these: nmap
subversion

Answer 1

It looks like your problems 1 and 2 are related. I am assuming you installed some version of Python beyond the one that comes on your Mac by default. The easiest and likely best way to fix this are the following steps:

1. Delete existing Python
2. Reinstall Python with these steps https://www.digitalocean.com/community/tutorials/how-to-install-python-3-and-set-up-a-local-programming-environment-on-macos
3. Run the command brew link nmap

This should fix your issues.