[PyQt] Newbe question about Print() to PyQt

[TimW]

In Gui Programming, you 'print' to widgets in different ways, depending on the type of widget.
Almost always passed as an argument.
I don't see anywhere in your code the definition of 'screen'

What kind of widget is being used?

There are many widgets that have text attributes, see: http://doc.qt.io/qt-5/examples-widgets.html

usually to display 'text' the attribute is something like text='value', but not always,

I am not currently using and 'screen' it's all printed to STDOUT. That is why I asked the question, I want to move to either tkinter or PyQt but I don't understand how to post multiple lines to a 'screen' and be able to dynamically update them as things change. All the examples just show a single line of text. I am obviously missing a basic concept here. How do I pass multiple lines of text (as in a for or while loop) to a screen?