对python中两种列表元素去重函数性能的比较方法

#!/usr/bin/python
#-*- coding:utf-8 -*-
import time
import random
 
l1 = []
leng = 10L
for i in range(0,leng):
 temp = random.randint(1,10)
 l1.append(temp)
print '测试列表长度为：',leng
#first set
last = time.clock()
l2 = list(set(l1))
print l2
now = time.clock()
print '第一种:',now-last
 
#second
last = time.clock()
l2 = {}.fromkeys(l1).keys()
print l2
now = time.clock()
print '第二种:',now-last