title: how to download or save a picture from a powerpoint ppt with python pptx
body: <p>I am working on powerpoints using python.pptx, where I am struggling to save certain picture from a slide to local system.Can anyone suggest me how to do it?</p>
  
  <p>Until now : I am able to print the shape, But dont know how to save the picture as we do with presentation using prs.save. </p>
  
  <pre><code>prs =Presentation('mypath/myPowerpoint.pptx')
  slide2 = prs.slides[1]       #i want to save picture in slide 2
  pic = slide2.shapes[4]       # i have check shape 5 is the picture
  print(pic.name)              # i am able to print the picture name
  pic.save('Mypic.jpg')        #------ this didn't work --------
  </code></pre>
  
  <p>Thanks in advance.</p>