one code by python for platforms

[DeaD_EyE]

Depends on the framework. Python is not well supported on Android and ios, but there is Kiviy, which allows you to write NUI (Natural User Interfaces) for Android, ios, Linux, Mac and Windows. This framework has it's own style. It's not using the native graphics library of the os. So this apps are looking everywhere the same.

But you can use also QT5 for developing GUIs ony many different devices.