from PyQt4.QtGui import QGraphicsScene, QApplication, QGraphicsView, QGraphicsEllipseItem
from PyQt4 import Qt, QtCore, QtGui
from PyQt4.Qt import QColor
import sys, random,code


app = QApplication(sys.argv)
scene = QGraphicsScene()

families = [1,2,3,4,5,6,7,8,9,10]
total = 0
set_angle = 0
count1 = 0
colours = []
total = sum(families)
size=300
for count in range(len(families)):
    number = []
    for count in range(3):
        number.append(random.randrange(0, 255))
    colours.append(QColor(number[0],number[1],number[2]))

for family in families:
    # Max span is 5760, so we have to calculate corresponding span angle
    angle = round(float(family*5760)/total)
    ellipse = QGraphicsEllipseItem(0,0,size,size)
    ellipse.setPos(0,0)
    ellipse.setStartAngle(set_angle)
    ellipse.setSpanAngle(angle)
    ellipse.setBrush(colours[count1])
    set_angle += angle
    count1 += 1
    scene.addItem(ellipse)

view = QGraphicsView(scene)
view.show()
view.setFixedSize(size+10,size+10)
app.exec_(code.interact(local=locals()))