hello, I can use the codes on my smartphone?

Answer 1

On a phone that is running Android, most preferably. You can create an application and compile it (if your language is compiled) into an APK and run it. Otherwise, you can just run it in an IDE.

Answer 2

For Python there are mini-IDEs for Android, for example QPython and Pydroid3.

So with Python you can write code on your smartphone.