'Gets a string representation of the symbol.'

def __repr__(self):

    name = self.name
    if (name is None):
        name = ',    '.join([i.name for i in self])
        return ('<%s    group    [%s]>' % (self.__class__.__name__, name))
    else:
        return ('<%s    %s>' % (self.__class__.__name__, name))
