62	            if xx > 0:
63	                try:
64	                    weight = float(x[xx+1:])
65	                    x = x[:xx]
66	                except:
67	                    pass
68	            out += [("(", 0.0)]+token_weights(x, weight, default_weight=default_weight)+[(")", 0.0)]
69	        else:
70	            out += [(x, weight)]