from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName(_fromUtf8("Dialog"))
        Dialog.resize(698, 481)
        self.ping = QtGui.QListWidget(Dialog)
        self.ping.setGeometry(QtCore.QRect(10, 40, 681, 431))
        self.ping.setObjectName(_fromUtf8("ping"))
        self.label = QtGui.QLabel(Dialog)
        self.label.setGeometry(QtCore.QRect(250, 10, 221, 31))
        font = QtGui.QFont()
        font.setPointSize(16)
        font.setBold(True)
        font.setWeight(75)
        self.label.setFont(font)
        self.label.setObjectName(_fromUtf8("label"))
        self.verticalScrollBar = QtGui.QScrollBar(Dialog)
        self.verticalScrollBar.setGeometry(QtCore.QRect(680, 40, 16, 431))
        self.verticalScrollBar.setOrientation(QtCore.Qt.Vertical)
        self.verticalScrollBar.setObjectName(_fromUtf8("verticalScrollBar"))

        self.retranslateUi(Dialog)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        Dialog.setWindowTitle(_translate("Dialog", "Dialog", None))
        self.label.setText(_translate("Dialog", "NETWORK PING ", None))


if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    Dialog = QtGui.QDialog()
    ui = Ui_Dialog()
    ui.setupUi(Dialog)
    Dialog.show()
    sys.exit(app.exec_())

Traceback (most recent call last):
  Line 1, in <module>
    from PyQt4 import QtCore, QtGui
ImportError: No module named PyQt4