In Pyqt5, QWindow, showMaximized() doesn't work. Why?

Question

It's a tiny simple code.

In this code, self.showMaximized() is not working.

And even it's so tiny, I don't know why.

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

class Window(QWindow):
    def __init__(self):
        QWindow.__init__(self)
        self.setTitle("title")
        self.showMaximized()
        # self.resize(400,300)
        # self.showMaximized()
        # self.showFullScreen()


app = QApplication(sys.argv)

screen = Window()
screen.show()

sys.exit(app.exec_())

---

Delete 'screen.show()', and then showMaximized() worked.

Answer 1

Either you need to use .showMaximized() only on newly created Object i.e., screen, but not in your constructor or only at the end of your constructor, but not twice.

Code:

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

class Window(QWindow):
    def __init__(self):
        QWindow.__init__(self)
        self.setTitle("title")


app = QApplication(sys.argv)

screen = Window()
screen.showMaximized()

sys.exit(app.exec_())