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First read in the image:

>>> import cv2
>>> img = cv2.imread("/path/to/your/image.jpg")

Then using cv2.split is as easy as doing:

>>> (channel_b, channel_g, channel_r) = cv2.split(img)

Which is equivalent to saying:

>>> (channel_b, channel_g, channel_r) = (img[:,:,0], img[:,:,1], img[:,:,2])

First read in the image:

>>> import cv2
>>> img = cv2.imread("/path/to/your/image.jpg")

Then using cv2.split is as easy as doing:

>>> (channel_b, channel_g, channel_r) = cv2.split(img)

Which is equivalent to saying:

>>> (channel_b, channel_g, channel_r) = (img[:,:,0], img[:,:,1], img[:,:,2])