'save(filething=None, padding=None)
Save a tag to a file.
If no filename is given, the one most recently loaded is used.
Args:
filething (filething)
padding (PaddingFunction)
Raises:
mutagen.MutagenError'

@loadfile(writable=True)
def save(self, filething, padding=None):

    try:
        self.tags._inject(filething.fileobj, padding)
    except (IOError, error) as e:
        reraise(self._Error, e, sys.exc_info()[2])
    except EOFError:
        raise self._Error('no    appropriate    stream    found')
