倒序输出

ll= [1,2,3,4,5]
print ll[::-1]

ll.reverse() 

for l in reversed(ll):
print l

 

倒序读取文件：

with open(filepath,'rb') as fo:
    lines = fo.readlines() #lines是一个list

for line in reversed(lines): #倒序读取行
     print line