<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_fullsize(self, kwargs):
 """ Get the fullsize rendition URL """

        fullsize_args = {}

        if 'absolute' in kwargs:
            fullsize_args['absolute'] = kwargs['absolute']

        for key in ('width', 'height', 'quality', 'format', 'background', 'crop'):
            fsk = 'fullsize_' + key
            if fsk in kwargs:
                fullsize_args[key] = kwargs[fsk]

        img_fullsize, _ = self.get_rendition(1, **fullsize_args)
        return img_fullsize