inputfile.py 文件源码

def is_image(stream):
        """Check if the content file is an image by analyzing its headers.

        Args:
            stream (str): A str representing the content of a file.

        Returns:
            str: The str mimetype of an image.
        """
        image = imghdr.what(None, stream)
        if image:
            return 'image/%s' % image

        raise TelegramError('Could not parse file content')