Why won't my main window center properly on the screen?

Question

I am trying to center my main window on my screen however neither of the two common ways are working. They both put it way too low and a little off center width wise. Here is what I have tried:

Way One:

screen = QDesktopWidget().screenGeometry()
x = int((screen.width() - self.width()) / 2)
y = int((screen.height() - self.height()) / 2)
self.move(x, y)

Way Two:

self.setGeometry(QStyle.alignedRect(Qt.LeftToRight, Qt.AlignCenter, self.size(),
                                            QDesktopWidget().availableGeometry()))

Note that right before doing this I set the width and height like this:

screen = QDesktopWidget().screenGeometry()
        ww = int(screen.width() / 1.5)
        wh = int(screen.height() / 2)

        self.resize(ww, wh)

Answer 1

you are moving the topLeft of your widget to the screen center that's why it is not centered. You should take into account the size of your widget.

x = QApplication().desktop().screenGeometry().center().x()
y = QApplication().desktop().screenGeometry().center().y()
self.move(x - self.geometry().width()/2, y - self.geometry().height()/2)

Edit :

this works if self is the mainWindow. If it is a widget with a parent, move will move(x,y) will move your widget relatively to its parent. you should translate the coordinates below (global coordinates) to Parent coordinates, using :

QPoint QWidget.mapFromGlobal (self, QPoint)