mouseReleaseEvent in painter example

feedback
1

The code for the line painter on the website currently says:

 def mouseReleaseEvent(self, e):
        self.last_x = None
        self.last_y = None

In the book it is:

def mouseReleaseEvent(self, e):
        self.last_x = e.x()
        self.last_y = e.y()

I believe the book is correct.

2

In the code to draw using mouseMoveEvent the position using e.x() and x.y() to draw the point using the current mouse position did not work for me. I had to use drawPoint(e.pos()) and worked fine. Also, it worked without addint the .setMouseTracking(True) line.

Another possible way to get the mouse position through the event variable e is e.pos().x() and e.pos().y().