code: def _image_to_data(img):
      
      # If the image is already encoded in Base64, we have nothing to do here
      if "src" not in img.attrs or img["src"].startswith("data:"):
          return
      elif re.match("https?://", img["src"]):
          img_data = _load_url(img["src"]).read()
      else:
          img_data = _load_file(img["src"]).read()
      img_type = imghdr.what("", img_data)
      img_b64 = base64.b64encode(img_data)
      src_data = "data:image/none;base64,"
      if img_type:
          src_data = "data:image/{};base64,{}".format(img_type, img_b64)
      img["src"] = src_data
docs: Does the work of encoding an image into Base64