title: change text of lineEdit when a radio button is selected in pyqt
body: <p>I have two <code>radioButtons</code> in the form made using qt designer, i am now programming in pyqt. i wish to change the text of <code>lineEdit</code> to "radio 1" when <code>radioButton</code> 1 is selected and "radio 2" when the <code>radioButton</code> 2 is selected. how can I achieve this?</p>