How to make a widget to display images in PyQt?

Question

Python

There is a very simple task - to count all the photos from a given directory and display their previews in a grid for users. It seems that everything is very simple, but it is not possible to make the width of the widget change dynamically.
Those. if the user expanded the program window, I would like the number of columns to increase, say, from 3 to 5. It is desirable without additional intervention in the code. All thumbnails will be the same size, but I would like to be able to change this size for the visually impaired. In general, the usual gallery. How to do it easier?
Python 2.7, Qt4

Answer 1

I see here also an android with a touch screen, definitely QML. There's Grid out of the box that does what you need.

Answer 2

'It is desirable without additional intervention in the code' - how is that? the window in the designer is made?