def insert_picture(self, image_file):
        pic = self._new_placeholder_pic(image_file)
        self._replace_placeholder_with(pic)
        return PlaceholderPicture(pic, self._parent)
Return a |PlaceholderPicture| object depicting the image in
dataset/ETHPy150Open scanny/python-pptx/pptx/shapes/placeholder.py/PicturePlaceholder.insert_picture