Please! Need help JUST TO START implementing Python code into QT designed forms

[OPG_79]

Dear users,

I am reading the Summerfield's PyQT book. Was fighting many days to start simple Python code in QT designed forms. I am using QT designer v. 4.8.0, Python v. 3.2.3. The simple program I am trying to make: Window with a pushButton, lineEdit and a textLabel. So what I want to do: when I push the button, the textLabel adopts the text from the lineEdit, that's it!

What I have done:
1. In QT designer drew a Dialog window with the three above metioned elements.
2. Using pyuic.py program converted the ui file to py file
3. created the following Python script:

from PyQt4.QtCore import *
from PyQt4.QtGui import *
import t_transfer   # my py file obtained in step 2, shown below
class DoItNow(QDialog, t_transfer.t_transfer):      #created my own class DoItNow, where I try to initialize the form. Not sure about this, though :)
    def __init__(self, parent=None):
        super(DoItNow, self).__init__(parent)
        self.setupUi(self)
 
    @pyqtSignature("")
        def on_pushButton_clicked(self):
             a =  lineEdit.text()
	     label.setText(a)
 
app = QApplication(sys.argv)
    form = Dialog()
    form.show()
    app.exec_()

from PyQt4.QtCore import *
from PyQt4.QtGui import *
import t_transfer   # my py file obtained in step 2, shown below
class DoItNow(QDialog, t_transfer.t_transfer):      #created my own class DoItNow, where I try to initialize the form. Not sure about this, though :)
    def __init__(self, parent=None):
        super(DoItNow, self).__init__(parent)
        self.setupUi(self)

    @pyqtSignature("")
        def on_pushButton_clicked(self):
             a =  lineEdit.text()
	     label.setText(a)
   
app = QApplication(sys.argv)
    form = Dialog()
    form.show()
    app.exec_()

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My t_transfer.py file

# -*- coding: utf-8 -*-
 
# Form implementation generated from reading ui file 't_transfer.ui'
#
# Created: Wed Aug  1 00:05:17 2012
#      by: PyQt4 UI code generator 4.9.1
#
# WARNING! All changes made in this file will be lost!
 
from PyQt4 import QtCore, QtGui
 
try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    _fromUtf8 = lambda s: s
 
class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName(_fromUtf8("Dialog"))
        Dialog.resize(400, 300)
        self.pushButton = QtGui.QPushButton(Dialog)
        self.pushButton.setGeometry(QtCore.QRect(230, 120, 75, 23))
        self.pushButton.setObjectName(_fromUtf8("pushButton"))
        self.lineEdit = QtGui.QLineEdit(Dialog)
        self.lineEdit.setGeometry(QtCore.QRect(50, 50, 113, 18))
        self.lineEdit.setObjectName(_fromUtf8("lineEdit"))
        self.label = QtGui.QLabel(Dialog)
        self.label.setGeometry(QtCore.QRect(50, 130, 111, 16))
        font = QtGui.QFont()
        font.setPointSize(14)
        font.setBold(True)
        font.setWeight(75)
        self.label.setFont(font)
        self.label.setObjectName(_fromUtf8("label"))
 
        self.retranslateUi(Dialog)
        QtCore.QMetaObject.connectSlotsByName(Dialog)
 
    def retranslateUi(self, Dialog):
        Dialog.setWindowTitle(QtGui.QApplication.translate("Dialog", "Dialog", None, QtGui.QApplication.UnicodeUTF8))
        self.pushButton.setText(QtGui.QApplication.translate("Dialog", "Do it!", None, QtGui.QApplication.UnicodeUTF8))
        self.label.setText(QtGui.QApplication.translate("Dialog", "TextLabel", None, QtGui.QApplication.UnicodeUTF8))
 
 
if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    Dialog = QtGui.QDialog()
    ui = Ui_Dialog()
    ui.setupUi(Dialog)
    Dialog.show()
    sys.exit(app.exec_())

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 't_transfer.ui'
#
# Created: Wed Aug  1 00:05:17 2012
#      by: PyQt4 UI code generator 4.9.1
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    _fromUtf8 = lambda s: s

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName(_fromUtf8("Dialog"))
        Dialog.resize(400, 300)
        self.pushButton = QtGui.QPushButton(Dialog)
        self.pushButton.setGeometry(QtCore.QRect(230, 120, 75, 23))
        self.pushButton.setObjectName(_fromUtf8("pushButton"))
        self.lineEdit = QtGui.QLineEdit(Dialog)
        self.lineEdit.setGeometry(QtCore.QRect(50, 50, 113, 18))
        self.lineEdit.setObjectName(_fromUtf8("lineEdit"))
        self.label = QtGui.QLabel(Dialog)
        self.label.setGeometry(QtCore.QRect(50, 130, 111, 16))
        font = QtGui.QFont()
        font.setPointSize(14)
        font.setBold(True)
        font.setWeight(75)
        self.label.setFont(font)
        self.label.setObjectName(_fromUtf8("label"))

        self.retranslateUi(Dialog)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        Dialog.setWindowTitle(QtGui.QApplication.translate("Dialog", "Dialog", None, QtGui.QApplication.UnicodeUTF8))
        self.pushButton.setText(QtGui.QApplication.translate("Dialog", "Do it!", None, QtGui.QApplication.UnicodeUTF8))
        self.label.setText(QtGui.QApplication.translate("Dialog", "TextLabel", None, QtGui.QApplication.UnicodeUTF8))


if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    Dialog = QtGui.QDialog()
    ui = Ui_Dialog()
    ui.setupUi(Dialog)
    Dialog.show()
    sys.exit(app.exec_())

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I would greatly appreciate your help!