The programs you write with Python here on Sololearn are all console-based.
That's standard text output where you can't control much of anything.
If you want color, you would have to write a graphical program, for example a windows application with tkinter (not possible on Sololearn).
One Sololearn-compatible way would be to use Brython, which translates Python to Javascript.
Then you're basically writing webcode with Python.
You will, however, need some knowledge of HTML and CSS then.
Take a look around Code Playground, you'll find plenty of Brython programs.
