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

[ChrisW67]

Your main program adapted with markers showing where:

from PyQt4.QtCore import *
from PyQt4.QtGui import *
 
from t_transfer import Ui_Dialog  #  <<<< Import the class the Designer built
 
class DoItNow(QDialog):
    def __init__(self, parent=None):
        super(DoItNow, self).__init__(parent)
 
        self.ui = Ui_Dialog()   # <<<< Creates an instance of the class the Designer built
        self.ui.setupUi(self)   # <<<< Finishes initialising it
 
    @pyqtSignature("")
    def on_pushButton_clicked(self):
         a = self.ui.lineEdit.text()  # <<<< self.ui refers to the ui object just like in C++
         self.ui.label.setText(a)
 
if __name__ == "__main__":
    import sys
    app = QApplication(sys.argv)
    form = DoItNow()      #<<<< your class is called DoItNow not Dialog
    form.show()
    sys.exit(app.exec_())

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

from t_transfer import Ui_Dialog  #  <<<< Import the class the Designer built

class DoItNow(QDialog):
    def __init__(self, parent=None):
        super(DoItNow, self).__init__(parent)

        self.ui = Ui_Dialog()   # <<<< Creates an instance of the class the Designer built
        self.ui.setupUi(self)   # <<<< Finishes initialising it

    @pyqtSignature("")
    def on_pushButton_clicked(self):
         a = self.ui.lineEdit.text()  # <<<< self.ui refers to the ui object just like in C++
         self.ui.label.setText(a)

if __name__ == "__main__":
    import sys
    app = QApplication(sys.argv)
    form = DoItNow()      #<<<< your class is called DoItNow not Dialog
    form.show()
    sys.exit(app.exec_())

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There are other ways to do the UI incorporation: http://www.riverbankcomputing.co.uk/.../designer.html