pyqt - criando um dialogo com botões

from PyQt4.QtCore import *
from PyQt4.QtGui import *
 
class Janela(QDialog):
 
    def __init__(self, parent=None):
        super(Janela, self).__init__(parent)

        botao1 = QPushButton("botao 1")
        botao2 = QPushButton("botao 2")

        vbox = QVBoxLayout()
 
        vbox.addWidget(botao1)
        vbox.addWidget(botao2)

        self.setLayout(vbox)
 
        self.connect(botao1, SIGNAL("clicked()"),
                self.click)
        self.connect(botao2, SIGNAL("clicked()"),
                self.click)
        
    def click(self):
        print 'oi'
 
form = Janela()
form.exec_()