Not working on python 3.4 and pyglet development

[Flowkap]

Failing with:

Traceback (most recent call last):
  File "main.py", line 894, in <module>
    main()
  File "main.py", line 886, in main
    window = Window(width=800, height=600, caption='Pyglet', resizable=True)
  File "main.py", line 480, in __init__
    self.model = Model()
  File "main.py", line 150, in __init__
    self._initialize()
  File "main.py", line 159, in _initialize
    for x in xrange(-n, n + 1, s):
NameError: name 'xrange' is not defined