python对文件排序

#!/usr/bin/env python
import os,datetime  


file_date = dict()


base_dir = '/SE/topwaf/vulnerability-scan/history/'  
list = os.listdir(base_dir)  


filelist = []  
for i in range(0, len(list)):  
    path = os.path.join(base_dir,list[i])  
    if os.path.isfile(path):  
filelist.append(list[i])  
    for i in range(0, len(filelist)):  
        path = os.path.join(base_dir, filelist[i])  
    if os.path.isdir(path):  
        continue  
    timestamp = os.path.getctime(path)  
    #print timestamp  
    date = datetime.datetime.fromtimestamp(timestamp)  
    #print list[i],'   ',date.strftime('%Y-%m-%d %H:%M:%S')  
    file_date[list[i]] = timestamp
    ts1 = os.stat(path).st_ctime  
    #print ts1  
#date = datetime.datetime.fromtimestamp(timestamp)  
#print list[i],'aa',date.strftime('%Y-%m-%d %H:%M:%S')  
orderlist= sorted(file_date.items(), key=lambda dict:dict[1])
#print file_date
print orderlist