I am not sure if this is a clear question.

I work on a python project that is based on terminal(console), for which I am planning to implement a GUI.

I am not major in CS so I really have no idea about how to effectively design a message system such that:

1. in console, it provide nice look info when runtime.
2. in GUI, it is directed to a certain widget, let's say, a text label, or a bottom bar, or a hide-able frame.

Do you have any suggestions?

Currently, I am using print function to provide essential informations on stdout during runtime. So a lot of print .... are distributed here and there among the code.

I am thinking to use macro-like variables such as 'FILE_NOT_EXTIS_MESSAGE' for printing, and define the variables in one file. Is this a standard way that people always do? How about I introduce a logging system?

In sum, I am ask for a pattern that people are commonly using for handling of screen output information with high effectiveness and adaptivity.