I want to use QtGui instead of QtWidget and I think it is not a deprecated module.

I am trying to make a LabeledSlider class that has all the logic for my slider contained within itself. Whenever I instantiate multiple of this class it causes the sliders to interact with one another when I move any of the sliders. Please help me fix this issue. My code is:

first of all, sorry for my English. My mother tongue is Spanish.
So, I am working on this mini project to learn python. I’m learning how to do UI using PyQt5. This application is simple, it has three inputs, one button, and one output.
I’m using MVC software pattern in this app and I have my view, model, and controller in separate files.

I’m working on a PyQt5 application for a course and need to implement a pop-up menu that appears when I right-click on the screen. I attempted to implement it, but I’m encountering an error stating that the PyQtSignal object has no connect attribute. According to the documentation, there should be a connect attribute, so I’m not sure what’s going wrong.

I want to rotate the icon of the QCursor.
I tried using the following code, but it seems not working, I can’t see the actual Size icon (I see the default icon) and the rotation is’t taking place.

I have a pyqt project where there is a large file processing, when I click on a button (Browse Folder) that will open a window containing treeviews that present the hierarchy of files, the window remains white for a few seconds, so here, I want to display a progress bar (like the loading one).
Here is my code :

I’m trying to run the following program:
`import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QTabWidget, QWidget, QGridLayout, QLineEdit, QPushButton

I would appreciate any help with the issue I am facing.
When I do execute my program it does give me the error message:

I would like help on how to allow the user to select a theme on the welcome page and it will change accordingly however when the user changes the theme on the theme_widget, it will then change and overwrite the previous theme and change the theme to the newly selected one on the theme_widget 

My program works fine untill, running a function few times, and after few times of running function the gui start turnning all white and grey, but functionallity works fine, have no idea why.