how to delete the rows with the delete button and how to edit with edit button

[dave2011]

the code that am sharing is just working for the add button only would you help me in the delete and edit button....thanks so much

from PyQt4 import QtGui , QtCore
class Example ( QtGui.QWidget ):
    row = 0
    def __init__ ( self ):
        super ( Example , self ). __init__ ()
        self.setGeometry (300 , 300 , 350 , 250)
        self.setWindowTitle ( " names " )
        #self.menubar()
        self.initData ()
        self.initUI ()
        row=0;
        col=0;
    def initData ( self ):
        data = ("David otewa","meshack Otewa" )
        self.model = QtGui.QStandardItemModel (12 , 1)
 
        col = 0
        for i in data :
            item = QtGui.QStandardItem(str((i)))
            self.model.setItem(self.row,col,item )
            self.row = self.row + 1
    def initUI ( self ):
        lv = QtGui . QListView( self )
        lv.setModel(self.model )
 
        layout=QtGui.QVBoxLayout()
        layout.addWidget(lv)
        col=0
        row=0
        add=QtGui.QPushButton("Add",self)
        add.move(265,30)
 
        self.connect(add, QtCore.SIGNAL('clicked()'), self.showDialog)
 
        delete=QtGui.QPushButton("Delete",self)
        delete.move(265,60)
 
        edit=QtGui.QPushButton("Edit",self )
        edit.move(265,90)
 
 
 
    def showDialog(self):
 
        text, ok = QtGui.QInputDialog.getText(self, 'Names', 
                'Enter your name:')
 
        if ok:
            name=str(text)
            self.add(name)
 
    def add(self,name):
        data=str(name)
        col=0
        if data != ("") :
            item = QtGui.QStandardItem(str((data)))
            self.model.setItem(self.row,col,item )
            self.row = self.row + 1
 
 
app=QtGui.QApplication([])
ex=Example()
ex.show()
app.exec_()