试题：
1. 去除list中的重复数据  [11, 22, 33, 11, 22] => [11, 22, 33]  

2. 格式化输出，三位一逗号  1234567 -> 1,234,567  

3. 字符反转  abcde -> edcba  

4. 打印当前系统的挂载点和空间大小（Linux）  

5. 模拟登录401验证网站（Basic HTTP Authentication）  

6. 获取远程某机器的系统当前日期时间（Linux）  

7. 打印Apache日志中访问次数最多的10条URL。  

8. 并发抓取10个URL，打印出HTTP状态码。

公布试题答案：
print '1.'
a = [11, 22, 33, 11, 22]
b = list(set(a))
b.sort()
print '%s => %s' % (a, b)
print

print '2.'
import re
a = '1234567'
b = re.sub(r"(?<=\d)(?=(\d{3})+\b)",",",a)
print '%s => %s' % (a, b)
print

print '3.'
a = 'abcde'
b = a[::-1]
print '%s => %s' % (a, b)
print

print '4.'
import commands
a = commands.getoutput('df -h')
for b in a.split('\n')[1:]:
    c = b.split()
    print '%-10s => %s' % (c[-1], c[1])
print

print '5.'
import urllib2
passman = urllib2.HTTPPasswordMgrWithDefaultRealm()
passman.add_password(None, "http://xxxxx", "smallfish", "***" )
authhandler = urllib2.HTTPBasicAuthHandler(passman)
opener = urllib2.build_opener(authhandler)
try:
    f = opener.open("http://xxxxx/dddd" )
    f.close()
    print 'login ok'
except urllib2.HTTPError:
    print 'login error'
print

print '6.'
import commands
a = commands.getoutput("ssh smallfish@haaku.net 'date'"  )
print 'now:', a
print

print '7.'
f = open("/var/log/apache2/access.log" )
a = {}
for line in f:
    url = re.findall(r'".*?"', line)[0].split()[1]
    a[url] = a.get(url, 0) + 1
b = sorted(a.items(), key=lambda x: x[1], reverse=True)
b = b[:10]
print b
print

print '8.'
urls = ['http://www.qq.com']
urls.append('http://www.163.com')
urls.append('http://www.sina.com.cn')
urls.append('http://www.sohu.com')
import gevent
from gevent import monkey
monkey.patch_socket()
import urllib2
import time
def get_http_status(url):
    f = urllib2.urlopen(url)
    c = f.getcode()
    return url, c
jobs = [gevent.spawn(get_http_status, url) for url in urls]
gevent.joinall(jobs, timeout=3)
for job in jobs:
    print job.value