Can't run code on chromebook/linux beta

I am new to coding and programming and am trying to use the Atom IDE to learn SQL and Python. I try running simple commands with both languages and receive errors, even though I am copying them straight off of the internet (just to test out the IDE and that it runs properly).

When I try to print “hello world” on python, I get the following messages:
Unable to run
python
Did you start Atom from the command line?
atom.
Is it in your PATH?
PATH: /usr/local/bin:/usr/bin:/usr/local/games:/usr/games

When I try to run on SQL I get the same message, but it says SQL instead of Python.

Again, I am new to this and would really like some help so I can learn how to code properly. Thank you/

Can you answer those questions positively? Otherwise, there’s your solution. You will find plenty of answers online to resolve this.