class test:
   def __init__(self):
        self.work = Work(self)
        self.connect(self.ui.pushButton_start_1,
                                QtCore.SIGNAL('clicked()'),
                                self.work.parse)

import sys
from PyQt4.QtCore import * 
from PyQt4.QtGui import * 

class Work(object):
    def __init__(self,parent):
        self.parent=parent
    def parse(self):
        print 1, self.parent

class test(object):
    def __init__(self):
        self.work = Work(self)
        self.hellobutton = QPushButton("Say 'Hello world!'",None)
        self.hellobutton.clicked.connect(self.work.parse)
        #self.connect(self.ui.pushButton_start_1,
                                #QtCore.SIGNAL('clicked()'),
                                #self.work.parse)
if __name__ == '__main__':
    app = QApplication(sys.argv)
    t=test()
    t.hellobutton.show()
    sys.exit(app.exec_())