Python-pptx

https://python-pptx.readthedocs.io/en/latest/ 

from pptx import Presentation

import tempfile

import s3fs

fs = s3fs.S3FileSystem()

prs = Presentation()

title_slide_layout = prs.slide_layouts[0]

slide = prs.slides.add_slide(title_slide_layout)

title = slide.shapes.title

subtitle = slide.placeholders[1]

title.text = "Hello, World!"

subtitle.text = "python-pptx was here!"

with tempfile.NamedTemporaryFile() as f:

    prs.save(f.name)

    fs.put_file(f.name, "BUCKET/title.pptx")

prs = Presentation()

bullet_slide_layout = prs.slide_layouts[1]

slide = prs.slides.add_slide(bullet_slide_layout)

shapes = slide.shapes

title_shape = shapes.title

body_shape = shapes.placeholders[1]

title_shape.text = "Adding a Bullet Slide"

tf = body_shape.text_frame

tf.text = "Find the bullet slide layout"

p = tf.add_paragraph()

p.text = "Use _TextFrame.text for first bullet"

p.level = 1

p = tf.add_paragraph()

p.text = "Use _TextFrame.add_paragraph() for subsequent bullets"

p.level = 2

with tempfile.NamedTemporaryFile() as f:

    prs.save(f.name)

    fs.put_file(f.name, "BUCKET/bullet.pptx")

with fs.open("BUCKET/title.pptx") as f:

    prs1 = Presentation(f)

with fs.open("BUCKET/bullet.pptx") as f:

    prs2 = Presentation(f)

prs = Presentation()

slide = prs.slides.add_slide(prs.slide_layouts[0])

slide.shapes.title.text = prs1.slides[0].shapes.title.text

slide.placeholders[1].text = prs1.slides[0].placeholders[1].text

slide = prs.slides.add_slide(prs.slide_layouts[1])

slide.shapes.title.text = prs2.slides[0].shapes.title.text

slide.shapes.placeholders[1].text_frame.text = prs2.slides[0].shapes.placeholders[1].text_frame.text

with tempfile.NamedTemporaryFile() as f:

    prs.save(f.name)

    fs.put_file(f.name, "BUCKET/combined.pptx")