abidrahmank/OpenCV2-Python-Tutorials — pull request #32 by sankethvedula (2014-08-17 08:57:07+00:00)
Title: In lines 57&58, the datatype is not specified!

That should be
lower_blue = np.array([110,50,50],dtype=uint8)
upper_blue = np.array([130,255,255],dtype=uint8)
Please edit that, otherwise it's giving an error.