add an image in every Powerpoint slide using python-pptx

pptximage.py

import pptx
import os
import re
import exifread
import time 
import pprint

from pptx.util import Cm
from PIL import Image
from random import shuffle

OUTPUT_TAG = "NameHere"
DEBUG = False

if not DEBUG: 
    # new
    prs = pptx.Presentation()
    # open
    # prs_exists = pptx.Presentation("some_presentation.pptx")

    # default slide width
    #prs.slide_width = 9144000
    # slide height @ 4:3
    #prs.slide_height = 6858000
    # slide height @ 16:9
    prs.slide_height = 5143500

    # title slide
    slide = prs.slides.add_slide(prs.slide_layouts[0])
    # blank slide
    #slide = prs.slides.add_slide(prs.slide_layouts[6])

    # set title
    title = slide.shapes.title
    title.text = "Lauren's & Tahlia's 18th Birthday Party"

    pic_left  = int(prs.slide_width * 0.15)
    pic_top   = int(prs.slide_height * 0.05)
    pic_width = int(prs.slide_width * 0.7)

rootdir = r'C:\Users\rdapaz.DESKTOP-QSI65RE\Desktop\Pictures'


def pretty_printer(o):
    pp = pprint.PrettyPrinter(indent=4)
    pp.pprint(o)


def exif_info2time(ts):
    """changes EXIF date ('2005:10:20 23:22:28') to number of seconds since 1970-01-01"""
    tpl = time.strptime(ts + 'UTC', '%Y:%m:%d %H:%M:%S%Z')
    return time.mktime(tpl)

def get_exif_date(img):
    tags = exifread.process_file(img)
    # pretty_printer(tags)
    dt = None
    if tags:
        all_dt_tags = [x for x in tags if re.search(r'(date|time)', x, re.IGNORECASE)]
        if all_dt_tags:
            tag = all_dt_tags[0]
            dt = '%s' % tags[tag]
    return dt 

images = []
for subdir, dirs, files in os.walk(rootdir):
        for my_file in files:
            if re.search(r'(jpg)$', my_file, re.IGNORECASE):
                filename = os.path.join(subdir, my_file)
                images.append(filename)

shuffle(images)

count = 0
failures = []
if not DEBUG:
    for filename in images:
        count += 1
        print(f'[{str(count).zfill(3)}] Processing {filename}...')
        with open(filename, 'rb') as fin:
            img = Image.open(fin)
        try:
            slide = prs.slides.add_slide(prs.slide_layouts[6])
            if img.height > img.width:
                pic  = slide.shapes.add_picture(filename, pic_left, pic_top, height=Cm(9.01))
            else:
                pic  = slide.shapes.add_picture(filename, pic_left, pic_top, height=Cm(11.43))
        except:
            failures.append(filename)

if not DEBUG:
    prs.save("%s.pptx" % OUTPUT_TAG)

for file in failures:
    print(file)