title: How change the font of a title of a slide in python-pptx?
body: <p>I want to change the font size and font style of the title of the slide. I also want to underline the title. How to do that?</p>
  <pre><code>from pptx import Presentation
  
  prs = Presentation(ppt_filename)
  
  slide = prs.slides[0]
  slide.shapes.title.text = 'New Title'
  slide.shapes.title.top = 100
  slide.shapes.title.left = 100
  slide.shapes.title.height = 200
  </code></pre>