[PyQt] Drawing on a QFrame

[Phil]

Thank you for reading this.

I'd like to draw on a QFrame.

The following does draw a line but not on the frame, instead the line is 
drawn on the main window.

I've done this years ago with Qt and C++ but I don't remember how I did it.

class DrawTest(QtGui.QMainWindow):
     def __init__(self, parent=None):
         super(DrawTest, self).__init__(parent)
         self.ui = Ui_MainWindow()
         self.ui.setupUi(self)
         frame = QtGui.QFrame()

     def paintEvent(frame, event):
         qp = QtGui.QPainter()
         qp.begin(frame)
         pen = QtGui.QPen(QtCore.Qt.yellow, 4)
         qp.setPen(pen)
         frame.drawLine(event, qp)
         qp.end()

     def drawLine(frame, event, qp):
         qp.drawLine(10, 10, 30, 30)

-- 
Regards,
Phil