code: def img2pdf(path, pdf_name=None):
      
      print("merge images in %s ..." % path)
      if not pdf_name:
          pdf_name = os.path.join(path, '%s.pdf' % os.path.split(path)[1])
      file_list = os.listdir(path)
  
      # filter pic in path
      pic_names = []
      img_suffix = ['.png', '.jpg', '.jpeg']
      for x in file_list:
          _, suffix = os.path.splitext(x)
          if suffix.lower() in img_suffix:
              pic_names.append(os.path.join(path, x))
      pic_names.sort()
  
      if len(pic_names) == 0:
          print("There is no images in %s" % path)
          return
  
      im_list = []
      im1 = Image.open(pic_names[0])
      pic_names.pop(0)
      for i in pic_names:
          img = Image.open(i)
          if img.mode == "RGBA":
              img = img.convert('RGB')
              im_list.append(img)
          else:
              im_list.append(img)
      im1.save(pdf_name, "PDF", resolution=100.0, save_all=True,
               append_images=im_list)
      print("images saved to：", pdf_name)
docs: 合并path目录下的所有图片到pdf文件中
  
      :param path: str
          图片路径
      :param pdf_name: str
          默认值 图片路径.pdf; pdf文件名