<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def convert(self, *formats):
 """Return an Image instance with the first matching format. For each format in ``*args``: If the image's :attr:`format` attribute is the same as the format, return self, otherwise try the next format. If none of the formats match, return a new Image instance with the last format. """

        for format in formats:
            format = Image.image_format(format)
            if self.format == format:
                return self
        else:
            return self._convert(format)