Crear thumbnails de 'JPEG'. Python

#!/usr/bin/env python3

import os, sys
from PIL import Image

size = (128, 128)

def jpegtothumb(infile: "original.jpeg", outfile: "new_name"):

    """
    converts `original.jpeg` to `new_name.jpeg` (thumbnail)
    default size to convert is (128, 128) in pixels
    default size keeps proportions from "infile"
    the format of "outfile" is JPEG

        Example:
                Assuming    "original.jpeg"         # infile
                            JPEG (474, 315) RGB

                            "new_name.jpeg"         # thumbnail
                            JPEG (128, 85) RGB      # keep proportions

    The "original.jpeg" to be modified must be in the same directory
    where the function is executed. If not, report:

                OSError: "cannot create thumbnail for original.jpeg"
    """

    if infile != outfile:
        try:
            with Image.open(infile) as im:
                im.thumbnail(size)
                im.save(outfile + ".jpeg", "JPEG")
        except OSError:
            print("cannot create thumbnail for", infile)

# jpegtothumb("original.jpeg", "new_name")   <-- use