Combine several images horizontally with Python

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I am trying to horizontally combine some JPEG images in Python.

Problem

I have 3 images - each is 148 x 95 - see attached. I just made 3 copies of the same image - that is why they are the same.

My attempt

I am trying to horizontally join them using the following code:

import sys
from PIL import Image

list_im = ["Test1.jpg","Test2.jpg","Test3.jpg"]

# creates a new empty image, RGB mode, and size 444 by 95
new_im = Image.new("RGB", (444,95))

for elem in list_im:
    for i in xrange(0,444,95):
        im=Image.open(elem)
        new_im.paste(im, (i,0))
new_im.save("test.jpg")

However, this is producing the output attached as test.jpg.

Question

Is there a way to horizontally concatenate these images such that the sub-images in test.jpg do not have an extra partial image showing?

Additional Information

I am looking for a way to horizontally concatenate n images. I would like to use this code generally so I would prefer to:

• not to hard-code image dimensions, if possible
• specify dimensions in one line so that they can be easily changed

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