def _normalised_python(self):
dx = (self.screen.width / float(len(self.points)))<EOL>oy = (self.screen.height)<EOL>for x, point in enumerate(self.points):<EOL><INDENT>y = (point - self.minimum) * <NUM_LIT> / self.extents * self.size.y<EOL>yield Point((<EOL>dx * x,<EOL>min(oy, oy - y),<EOL>))<EOL><DEDENT>
Normalised data points using pure Python.