self.date_field = QtGui.QLineEdit(self)
            self.date_field.setText('')
            self.date_field.setInputMask("B9.9999;_")
            self.date_field.setMaximumSize(75, 25)
            self.mainLayout.addWidget(self.date_field, 0, 5)
            # по нажатию Enter появляется поле для ввода имени и фамилии сотрудника
            self.connect(self.date_field, QtCore.SIGNAL('returnPressed()'),
                         self.raiseWorkmanField)
    #метод создающий поле для ввода имени и фамилии сотрудника
    def raiseWorkmanField (self):
        self.workman_field = QtGui.QLineEdit(self)
        self.workman_field.setText('')
        self.workman_field.setFocus()
        self.workman_field.setMaximumSize(150, 25)
        self.workman_field.setCompleter(QtGui.QCompleter(self.workman_lst))
        self.mainLayout.addWidget(self.workman_field, 0, 6)
        self.connect(self.workman_field, QtCore.SIGNAL('returnPressed()'),
                 lambda: (self.information(date=(self.date_field.text()),workman=(self.workman_field.text())),
                 self.date_field.deleteLater(), self.comboBox_sort.setCurrentIndex(0),self.delWorkmanField()))
    #удаление поля для ввода фамилии сотрудника
    def delWorkmanField (self):
        self.mainLayout.removeWidget(self.workman_field)    #удаление поля из layout
        self.workman_field.deleteLater()                    #удаление поля как объекта PyQt4
        self.workman_field.setParent(None)                 #лишение поля родителя
        del self.workman_field                              #удаление объекта Python

 # -*- coding: utf-8 -*-
import sys
from PyQt4 import QtGui
from PyQt4 import QtCore
class WIndow(QtGui.QWidget):
    def __init__(self, parent=None):
        QtGui.QMainWindow.__init__(self, parent)
        self.layout = QtGui.QVBoxLayout(self)
        self.layout.setAlignment(QtCore.Qt.AlignCenter)
        self.label = QtGui.QLabel(text='Object')
        self.layout.addWidget(self.label)
        self.lineEdit = QtGui.QLineEdit()
        self.layout.addWidget(self.lineEdit)
        self.button = QtGui.QPushButton('DELETE')
        self.layout.addWidget(self.button)
        self.button.clicked.connect(self.deleteLineEdit)
        self.show()
    def deleteLineEdit(self):
        self.layout.removeWidget(self.lineEdit)
        self.lineEdit.deleteLater()
        self.lineEdit.setParent(None)
        del self.lineEdit
        print('work')
app = QtGui.QApplication(sys.argv)
mainWin=WIndow()
sys.exit(app.exec_())

 self.button2.clicked.connect(lambda: print(self.lineEdit.text()))