Python2.7-pyqt4-eric6 读取标准文本框内容，选择文件夹并显示绝对路径

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代码如下：

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

"""
Module implementing zhangcopy.
"""
import sys
from PyQt4.QtCore import pyqtSignature
from PyQt4.QtGui import QDialog, QFileDialog
from PyQt4.QtGui import QApplication

from Ui_zhangcopywindow import Ui_Dialog


class zhangcopy(QDialog, Ui_Dialog):
    """
    Class documentation goes here.
    """
    text1=''
    text2=''
    text3=''
    path=''
    def __init__(self, parent=None):
        """
        Constructor
        
        @param parent reference to the parent widget
        @type QWidget
        """
        QDialog.__init__(self, parent)
        self.setupUi(self)
    
    @pyqtSignature("")
    def on_pushButton_1_clicked(self):
        """
        Slot documentation goes here.
        """
        # TODO: not implemented yet
        #raise NotImplementedError
        text1=self.lineEdit.text()#读取text的内容
        text2=self.lineEdit_2.text()
        self.label_4.setText(text1+text2)
    
    @pyqtSignature("QString")
    def on_lineEdit_textEdited(self, p0):
        """
        Slot documentation goes here.
        
        @param p0 DESCRIPTION
        @type QString
        """
        # TODO: not implemented yet
       # raise NotImplementedError
       
    
    @pyqtSignature("QString")
    def on_lineEdit_2_textEdited(self, p0):
        """
        Slot documentation goes here.
        
        @param p0 DESCRIPTION
        @type QString
        """
        # TODO: not implemented yet
       # raise NotImplementedError
    
    @pyqtSignature("QString")
    def on_lineEdit_3_textEdited(self, p0):
        """
        Slot documentation goes here.
        
        """
        # TODO: not implemented yet
        #raise NotImplementedError
    
    @pyqtSignature("")
    def on_pushButton_3_clicked(self):
        """
        Slot documentation goes here.
        
        """
        # TODO: not implemented yet
       # raise NotImplementedError
        open=QFileDialog()
        path=open.getExistingDirectory(self, "choose directory", "G:\\")#专门的函数
        print path
        strpath=unicode(path.toUtf8(), 'utf-8', 'ignore') 
        self.lineEdit_3.setText(strpath)
        
if __name__ == '__main__':
   
    app = QApplication(sys.argv)
    dlg = zhangcopy()
    dlg.show() #之前少加了一个括号
    sys.exit(app.exec_())