[Python] How to Cut an Image Vertically into Two Equal Sized Images

So I have an 800 x 600 image that I want to cut vertically into two equally sized pictures using OpenCV 3.1.0. This means that at the end of the cut, I should have two images that are 400 x 600 each and are stored in their own PIL variables.

Here's an illustration:



Thank you.

EDIT: I want the most efficient solution so if that solution is using numpy splicing or something like that then go for it.

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