python 出错 'int' object is not iterable大佬们有什么好的建议？

Question

t=0W=[2,2,2,3,3,3,5,5,5,5,8,8]UW=[2,3,5,8]Tfit=[12,24,25]forjinrange(len(UW)):
t=t+sum(W.count(UW[j])*max(Tfit)/len(W))
错误提示：Traceback(mostrecentcalllast):File"C:/Users/zb/Desktop/compute.py",line6,in
t=t+sum(W.count(UW[j])*max(Tfit)/len(W))
TypeError:'float'objectisnotiterable去掉“/len（W）”时，显示：TypeError:'int'objectisnotiterable