add reduce import to fractal demo

examples/fractal.py

@@ -4,6 +4,7 @@ Displays an interactive Koch fractal
 """
 import initExample ## Add path to library (just for examples; you do not need this)
 
+from functools import reduce
 import pyqtgraph as pg
 from pyqtgraph.Qt import QtCore, QtGui
 import numpy as np
@@ -111,12 +112,4 @@ if __name__ == '__main__':
     import sys
     if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
         QtGui.QApplication.instance().exec_()
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