Create a new MediaList instance.
        @param mrls: optional list of MRL strings

def media_list_new(self, mrls=None):
        """Create a new MediaList instance.
        @param mrls: optional list of MRL strings
        """
        l = libvlc_media_list_new(self)
        # We should take the lock, but since we did not leak the
        # reference, nobody else can access it.
        if mrls:
            for m in mrls:
                l.add_media(m)
        l._instance = self
        return l