How to position fullscreen widget in the center of the screen?

Question

Python

The question in itself sounds silly, but nevertheless. We have this code:

class MainWindow(QWidget):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.screenshot = QApplication.primaryScreen().grabWindow(0)
        self.settings()
        self.create_widgets()
        self.set_layout()

    def settings(self):
        self.setWindowFlags(QtCore.Qt.FramelessWindowHint)
        self.setWindowState(QtCore.Qt.WindowFullScreen)

    def create_widgets(self):
        self.image_preview = QLabel()
        self.image_preview.setPixmap(self.screenshot)

    def set_layout(self):
        self.layout = QGridLayout(self)
        self.layout.addWidget(self.image_preview, 0, 0, alignment=QtCore.Qt.AlignCenter)
        self.setLayout(self.layout)

We take a screenshot of the screen, and in QLabel we display it on the screen without frames and buttons. And we get a slightly moved window to the right down, as in the screenshot (white frame on the left and top).

1. Is it about QGridLayout?
   
2. How to fix?
   

Answer 1

The answer is simple. It was necessary to adjust the padding of the content field.
self.layout.setContentsMargins(0, 0, 0, 0)