Return a |PlaceholderPicture| object depicting the image in
        *image_file*, which may be either a path (string) or a file-like
        object. The image is cropped to fill the entire space of the
        placeholder. A |PlaceholderPicture| object has all the properties and
        methods of a |Picture| shape except that the value of its
        :attr:`~._BaseSlidePlaceholder.shape_type` property is
        `MSO_SHAPE_TYPE.PLACEHOLDER` instead of `MSO_SHAPE_TYPE.PICTURE`.

def insert_picture(self, image_file):
        """
        Return a |PlaceholderPicture| object depicting the image in
        *image_file*, which may be either a path (string) or a file-like
        object. The image is cropped to fill the entire space of the
        placeholder. A |PlaceholderPicture| object has all the properties and
        methods of a |Picture| shape except that the value of its
        :attr:`~._BaseSlidePlaceholder.shape_type` property is
        `MSO_SHAPE_TYPE.PLACEHOLDER` instead of `MSO_SHAPE_TYPE.PICTURE`.
        """
        pic = self._new_placeholder_pic(image_file)
        self._replace_placeholder_with(pic)
        return PlaceholderPicture(pic, self._parent)