from pptx import Presentation
from pptx.util import Inches, Pt

prs = Presentation()

# タイトルスライド
title_slide = prs.slides.add_slide(prs.slide_layouts[0])
title = title_slide.shapes.title
subtitle = title_slide.placeholders[1]
title.text = "プレゼンテーションタイトル"
subtitle.text = "サブタイトル"

# コンテンツスライド
content_slide = prs.slides.add_slide(prs.slide_layouts[1])
title = content_slide.shapes.title
title.text = "主なポイント"

content = content_slide.placeholders[1]
tf = content.text_frame
tf.text = "ポイント1"

p = tf.add_paragraph()
p.text = "ポイント2"
p.level = 1

# 画像スライド
img_slide = prs.slides.add_slide(prs.slide_layouts[6])
left = Inches(1)
top = Inches(1)
img_slide.shapes.add_picture('chart.png', left, top, width=Inches(8))

prs.save('presentation.pptx')