[Python] Combine several images horizontally with Python

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:

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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