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I tried and same problem
Thank for your feedback; sorry to hear about your troubles.
Microsoft’s Visual Studio Code is the editor that will suit you best, not Github Atom. Atom works best for guys already in the “game”. (No disrespect toward Atom, just stating the focus group.)
I admire your energy. Getting your computer configured for programming needs you to focus that energy.
Please research how to get Python 3 working on your Mac ~ python.org has work pages on this. Confirm independently of Atom / vsCode that Python 3 is working well. Special focus on the run environment.
1 - Install & confirm Python 3 on Mac (python.org)
2 - Visual Studio Code as your text editor.