howto pyqt project taskmanager

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'a.ui'
#
# Created: Sat Oct  2 02:08:21 2010
#      by: PyQt4 UI code generator 4.7.2
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui

class Ui_MainWindow(QtGui.QMainWindow):

  def __init__(self):
  self.widget=QtGui.QMainWindow()
  self.setupUi(self.widget)

  def setupUi(self, MainWindow):
  self.widget.setGeometry(QtCore.QRect(0, 0, 500, 500))
      MainWindow.setObjectName("MainWindow")
      self.centralwidget = QtGui.QWidget(MainWindow)
      self.centralwidget.setObjectName("centralwidget")
      self.but_show_proc = QtGui.QPushButton(self.centralwidget)
      self.but_show_proc.setGeometry(QtCore.QRect(100, 400, 93, 27))
      self.but_show_proc.setObjectName("but_show_proc")
      self.tableWidget = QtGui.QTableWidget(self.centralwidget)
      self.tableWidget.setGeometry(QtCore.QRect(90, 30, 340, 341))
      self.tableWidget.setObjectName("tableWidget")
      self.tableWidget.setColumnCount(3)
      self.tableWidget.setRowCount(0)
      item = QtGui.QTableWidgetItem()
      self.tableWidget.setHorizontalHeaderItem(0, item)
      item = QtGui.QTableWidgetItem()
      self.tableWidget.setHorizontalHeaderItem(1, item)
      item = QtGui.QTableWidgetItem()
      self.tableWidget.setHorizontalHeaderItem(2, item)
      self.but_shutdown = QtGui.QPushButton(self.centralwidget)
      self.but_shutdown.setGeometry(QtCore.QRect(260, 400, 93, 27))
      self.but_shutdown.setObjectName("but_shutdown")
      MainWindow.setCentralWidget(self.centralwidget)
      self.menubar = QtGui.QMenuBar(MainWindow)
      self.menubar.setGeometry(QtCore.QRect(0, 0, 549, 23))
      self.menubar.setObjectName("menubar")
      MainWindow.setMenuBar(self.menubar)
      self.statusbar = QtGui.QStatusBar(MainWindow)
      self.statusbar.setObjectName("statusbar")
      MainWindow.setStatusBar(self.statusbar)
  QtCore.QObject.connect(self.but_shutdown,QtCore.SIGNAL("clicked()"),self.shutdown)
  QtCore.QObject.connect(self.but_show_proc,QtCore.SIGNAL("clicked()"),self.show_process)
  self.show_process()
      self.retranslateUi(MainWindow)
      QtCore.QMetaObject.connectSlotsByName(MainWindow)

  def show_process(self):
  try:
      import subprocess as subp
      f1 = subp.Popen(['ps', '-au'], stdout = subp.PIPE)
      lines = []
      for l in f1.stdout.readlines():
          lines.append(l)
      self.tableWidget.setRowCount(len(lines[1:]))
      r = 0
      for x in lines[1:]:
          item=QtGui.QTableWidgetItem()
          item.setText(x.split(' ')[6])
          self.tableWidget.setItem(r,0,item)

          item=QtGui.QTableWidgetItem()
          item.setText(x.split(' ')[8])
          self.tableWidget.setItem(r,1,item)

          item=QtGui.QTableWidgetItem()
          item.setText(x.split(' ')[10])
          self.tableWidget.setItem(r,2,item)
          r += 1
  except Exception, e:
      print e

  def shutdown(self):
  import subprocess as subp
  subp.Popen('poweroff') 

  def retranslateUi(self, MainWindow):
      MainWindow.setWindowTitle(QtGui.QApplication.translate("MainWindow",
"Task Manager", None, QtGui.QApplication.UnicodeUTF8))
      self.but_show_proc.setText(QtGui.QApplication.translate("MainWindow",
"Refresh", None, QtGui.QApplication.UnicodeUTF8))
      self.tableWidget.horizontalHeaderItem(0).setText(QtGui.QApplication.
translate("MainWindow", "PID", None, QtGui.QApplication.UnicodeUTF8))
      self.tableWidget.horizontalHeaderItem(1).setText(QtGui.QApplication.
translate("MainWindow", "Cpu", None, QtGui.QApplication.UnicodeUTF8))
      self.tableWidget.horizontalHeaderItem(2).setText(QtGui.QApplication.
translate("MainWindow", "Mem", None, QtGui.QApplication.UnicodeUTF8))
      self.but_shutdown.setText(QtGui.QApplication.translate("MainWindow",
"Shutdown", None, QtGui.QApplication.UnicodeUTF8))


import sys
if __name__ == "__main__":
  app=QtGui.QApplication(sys.argv)
  obj=Ui_MainWindow()
  obj.widget.show()
  sys.exit(app.exec_())