How to display the stdout of a command with PyQt

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http://www.saltycrane.com/blog/2007/12/how-to-display-stdout-of-command-with/

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This widget contains a QPushButton and a QTextEdit box. When the button is pushed, the results of the dir is displayed in the text box.

import os
import sys 
from PyQt4.QtCore import * 
from PyQt4.QtGui import * 
 
def main(): 
    app = QApplication(sys.argv) 
    w = MyWindow() 
    w.show() 
    sys.exit(app.exec_()) 
 
class MyWindow(QWidget): 
    def __init__(self, *args): 
        QWidget.__init__(self, *args) 
 
        # create objects
        self.pb = QPushButton(self.tr("Run command"))
        self.te = QTextEdit()

        # layout
        layout = QVBoxLayout(self)
        layout.addWidget(self.pb)
        layout.addWidget(self.te)
        self.setLayout(layout) 

        # create connection
        self.connect(self.pb, SIGNAL("clicked(bool)"),
                     self.run_command)

    def run_command(self):
        stdouterr = os.popen4("dir")[1].read()
        self.te.setText(stdouterr)
  
if __name__ == "__main__": 
    main()