python 根据文件创建时间排序

#coding:utf8
import os,time

directory = "d:/scrapy tutorial/"
t = []
d = {}
for filename in os.listdir(directory):
path = directory + filename
time1 = time.ctime(os.path.getmtime(path))
d[time1] = filename
t.append(time1)
n = 1
for i in sorted(t):
fn = directory + d[i]
new_fn = directory + str(n) + '. ' + d[i]
##        if n<10:
##                new_fn = directory + d[i][1:]
##        else:
##                new_fn = directory + d[i][2:]
os.rename(fn, new_fn)
n += 1