import os
import comtypes.client
def export_presentation(path_to_ppt, path_to_folder):
  if not (os.path.isfile(path_to_ppt) and os.path.isdir(path_to_folder)):
    raise "Please give valid paths!"
  powerpoint = comtypes.client.CreateObject("Powerpoint.Application")
  # Needed for script to work, though I don't see any reason why...
  powerpoint.Visible = True
  powerpoint.Open(path_to_ppt)
  # Or some other image types
  powerpoint.ActivePresentation.Export(path_to_folder, "JPG")
  #这里可以写成：
  #Presentation.Slides[1].Export("C:/path/to/jpg.jpg","JPG",800,600);
  powerpoint.Presentations[1].Close()
  powerpoint.Quit()