[Python] Overwrite image in PIL instead of opening new window

I'm sending a stream of JPEG images from a Raspberry Pi to my MBP via a simple socket programme in Python 2.7.

When I read the image from the stream on my MBP, it opens up in Preview and opens a new Preview window for every separate image. I have an fps of about 2/3 and obviously 2/3 new windows per second is impossible to work with.

How can I go about only opening one Preview window and simply overwriting the displayed image? Would OpenCV be the best way to go? If so I am unsure how to.

Here is how I read the stream and display the images:

image_len = struct.unpack('<L', connection.read(struct.calcsize('<L')))[0]
if not image_len:
break
image_stream = io.BytesIO()
image_stream.write(connection.read(image_len))
image_stream.seek(0)
image = Image.open(image_stream)
image.show()

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