If you are going to code on your phone I personally would recomend using the 'CodePlayground' which SoloLearn offers, it's very easy to use, as well as nice to use.
If not stick to the computer using Sublime Text 3.
Ryan Sullivan (Suvan)
Try it out!!!
with Sololearn app, you’ll often encounter a “time limit error” after delaying seconds for resulting, if you typed wrong method or some of complicated methods to proceed with.
I haven’t seen any better than Pythonista so far.