Cannot exit fullscreen mode - python-3.x

Question

I was just testing the fullscreen mode, but I can't exit fullscreen.
How do you exit fullscreen?
My code:
import sys
from PyQt5.QtGui import QKeySequence
from PyQt5.QtWidgets import QApplication, QLabel, QMainWindow, QShortcut
from PyQt5.QtCore import Qt
# Subclass QMainWindow to customise your application's main window
class MainWindow(QMainWindow):
def __init__(self, *args, **kwargs):
super(MainWindow, self).__init__(*args, **kwargs)
self.setWindowTitle("Hello fullscreen world")
label = QLabel("Hello fullscreen world")
# The `Qt` namespace has a lot of attributes to customise
# widgets. See: http://doc.qt.io/qt-5/qt.html
label.setAlignment(Qt.AlignCenter)
# Set the central widget of the Window. Widget will expand
# to take up all the space in the window by default.
self.setCentralWidget(label)
self.shortcut_close_window = QShortcut(QKeySequence('F11'), self)
self.shortcut_close_window.activated.connect(self.goFullscreen)
def goFullscreen(self):
if self.isFullScreen():
self.exitFullScreen()
else:
self.setWindowFlags(Qt.WindowCloseButtonHint | Qt.WindowType_Mask)
self.showFullScreen()
app = QApplication(sys.argv)
window = MainWindow()
window.show()
app.exec_()
If I run that, it gives the error: AttributeError: 'MainWindow' object has no attribute 'exitFullScreen'
I also tried changing self.exitFullScreen() to
self.hide()
self.show()
but that just hides the window and shows it again in fullscreen mode.
I also tried changing it to self.showMaximized(), but that doesn't work either.

Answer 1

From the docs on showFullScreen: "To return from full-screen mode, call showNormal()."
E.g.:
def goFullscreen(self):
if self.isFullScreen():
self.showNormal()
else:
...
You should remember to restore the window flags when restoring from full screen mode, e.g.:
def goFullscreen(self):
if self.isFullScreen():
self.setWindowFlags(self._flags)
self.showNormal()
else:
self._flags = self.windowFlags()
self.setWindowFlags(Qt.WindowCloseButtonHint | Qt.WindowType_Mask)
self.showFullScreen()