如何在Ubuntu中运行Python Qt文件？

Question

Here's the sample code that I want to run:

import sys
from PyQt4 import QtGui

app = QtGui.QApplication(sys.argv)

window = QtGui.QWidget()
window.setGeometry(0, 0, 500, 300)
window.setWindowTitle("Dummy PyQt file")

window.show()

The file is saved as sample.py . The following command isn't working:

$ python ./sample.py

Answer 1

You need to call app.exec_() to start the Qt event loop . Without it the program exits immediately before anything can be shown on screen.

Answer 2

You need to start the Qt event loop by calling app.exec_() once you have initialised the widgets and called show() on your main window.

import sys
from PyQt4 import QtGui

app = QtGui.QApplication(sys.argv)

window = QtGui.QWidget()
window.setGeometry(0, 0, 500, 300)
window.setWindowTitle("Dummy PyQt file")
window.show()
app.exec_()