linter-flake8 and atom Windows 10 PATH to cmd.exe

I ended up fixing this with online help. I believe I ran into trouble because I had installed all packages within atom itself.

I may have have installed the pip packages incorrectly.

Anyway, I removed everything and rebooted. Then followed this:

Then, I made sure my environment variables were correct. I want Python 3 at the top.

Then I reinstalled Atom and updated. Rebooted again.

Then I installed everything through pip3 and apm on the command line, rather than through the UI in atom editor.

Started atom, allowed firewall, let it update dependencies.

Rebooted. Worked! Still not sure why though; what I've done this time is essentially no different as far as I can tell.