KMeans with OpenCV

http://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_ml/py_kmeans/py_kmeans_opencv/py_kmeans_opencv.html

Python Function Arguments

In contrast to many languages, python has several types of parameters to be sent to a function:

• Required arguments
• Keyword arguments
• Default arguments
• Variable-length arguments

A tutorial about that is here: 
http://www.tutorialspoint.com/python/python_functions.htm

Tutorial to work with Python and Opencv

Complete tutorial.
http://www.pyimagesearch.com/2015/07/20/install-opencv-3-0-and-python-3-4-on-ubuntu/