pyQt 写的小窗口 获取文本框内容

import sys
from PyQt4 import QtGui,QtCore
class MainWindow(QtGui.QWidget):
    def __init__(self,parent=None):
        
        QtGui.QWidget.__init__(self,parent)
        self.setWindowTitle('酒店管理')
        self.setWindowIcon(QtGui.QIcon('fire.jpg'))
        houseNum = QtGui.QLabel('房价号')     
        price = QtGui.QLabel('房款')
        yajin = QtGui.QLabel('押金')
        ruzhu = QtGui.QLabel('入住')
        qiandan = QtGui.QLabel('签单')
        date = QtGui.QLabel('日期')
        
        self.houseNumEdit  = QtGui.QLineEdit()
        self.priceEdit     = QtGui.QLineEdit()
        self.yajinEdit     = QtGui.QLineEdit()
        self.ruzhuEdit     = QtGui.QLineEdit()
        self.qiandanEdit   = QtGui.QLineEdit()
        self.dateEdit      = QtGui.QLineEdit()
        grid =QtGui.QGridLayout()
        
        grid.addWidget(houseNum,1,0)
        grid.addWidget(self.houseNumEdit,1,1)
        grid.addWidget(price,2,0)
        grid.addWidget(self.priceEdit,2,1)
        grid.addWidget(yajin,3,0)
        grid.addWidget(self.yajinEdit,3,1)
        grid.addWidget(ruzhu,4,0)
        grid.addWidget(self.ruzhuEdit,4,1)
        grid.addWidget(qiandan,5,0)
        grid.addWidget(self.qiandanEdit,5,1)
        grid.addWidget(date,6,0)
        grid.addWidget(self.dateEdit,6,1)
        
        ok = QtGui.QPushButton('确定')
        grid.addWidget(ok,7,0)

        
        self.setLayout(grid)
        
        
        self.resize(550,400)
        self.connect(ok,QtCore.SIGNAL('clicked()'), self.addNum)  #OK按钮 的clicked()时间 信号 绑定到addNum这个函数 也叫槽
    def addNum(self):
        houseNum = self.houseNumEdit.text()   #获取文本框内容
        yajin = self.yajinEdit.text()
        price = self.priceEdit.text()
        ruzhu = self.ruzhuEdit.text()
        qiandan = self.qiandanEdit.text()
        date = self.dateEdit.text()
        
        print('房间号: %s 押金: %s 房款: %s 入住: %s 签单: %s 日期: %s' % (houseNum,
                                                              yajin,price,ruzhu,
                                                              qiandan,date))
        
app = QtGui.QApplication(sys.argv)
main = MainWindow()
main.show()
sys.exit(app.exec_())