def __init__(self, parent=None):     QtGui.QMainWindow.__init__(self,parent)     self.table = QtGui.QTableWidget()     self.table.setColumnCount(3)     self.setCentralWidget(self.table)     data1 = ['row1','row2','row3','row4']     data2 = ['1','2.0','3.00000001','3.9999999']     combo_box_options = ["Option 1","Option 2","Option 3"]      self.table.setRowCount(4)      for index in range(4):         item1 = QtGui.QTableWidgetItem(data1[index])         self.table.setItem(index,0,item1)         item2 = QtGui.QTableWidgetItem(data2[index])         self.table.setItem(index,1,item2)         #Creat combobox          combo = QtGui.QComboBox()         for t in combo_box_options:             combo.addItem(t)             pass         self.table.setCellWidget(index,2,combo)         pass     return