[Python] How to save pygame Surface as an image to memory (and not to disk)

I am developing a time-critical app on a Raspberry PI, and I need to send an image over the wire. When my image is captured, I am doing like this:

# pygame.camera.Camera captures images as a Surface
pygame.image.save(mySurface,'temp.jpeg')
_img = open('temp.jpeg','rb')
_out = _img.read()
_img.close()
_socket.sendall(_out)


This is not very efficient. I would like to be able to save the surface as an image in memory and send the bytes directly without having to save it first to disk.

Thanks for any advice.

EDIT: The other side of the wire is a .NET app expecting bytes

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