PyQt 窗口未显示在屏幕上

Question

I am a beginner learning PyQt and the following code is not displaying any window on the screen, though I can see that the build is successful. I'm not able to recognize the mistake, could you help me please?

#!/usr/bin/python
import sys
from PyQt4 import QtGui


def main():
    app = QtGui.QApplication(sys.argv)

    w = QtGui.QWidget()
    w.resize(250, 150)
    w.move(300, 300)
    w.setWindowTitle('Simple')
    w.show()
    app.exec_()

if __name__ == '__main__':
    main()

Answer 1

Try to add sys.exit(app.exec_()) at the end of main() function.

This worked for me (I use python3):

import sys
from PyQt4 import QtGui

app = QtGui.QApplication(sys.argv)

frame = QtGui.QMainWindow()
frame.setGeometry(50, 50, 600, 400)
frame.setWindowTitle('FrameTitle')

frame.show()

sys.exit(app.exec_())

Answer 2

Try to use the following:

window = QMainWindow()
window.setWindowTitle('PictureWorkshop');