def?get_user_agent():

'''

隨機獲取一個用戶代理

'''

user_agents=[

"Mozilla/4.0?(compatible;?MSIE?6.0;?Windows?NT?5.1;?SV1;?AcooBrowser;?.NET?CLR?1.1.4322;?.NET?CLR?2.0.50727)",

"Mozilla/4.0?(compatible;?MSIE?7.0;?Windows?NT?6.0;?Acoo?Browser;?SLCC1;?.NET?CLR?2.0.50727;?Media?Center?PC?5.0;?.NET?CLR?3.0.04506)",

"Mozilla/4.0?(compatible;?MSIE?7.0;?AOL?9.5;?AOLBuild?4337.35;?Windows?NT?5.1;?.NET?CLR?1.1.4322;?.NET?CLR?2.0.50727)",

"Mozilla/5.0?(Windows;?U;?MSIE?9.0;?Windows?NT?9.0;?en-US)",

"Mozilla/5.0?(compatible;?MSIE?9.0;?Windows?NT?6.1;?Win64;?x64;?Trident/5.0;?.NET?CLR?3.5.30729;?.NET?CLR?3.0.30729;?.NET?CLR?2.0.50727;?Media?Center?PC?6.0)",

"Mozilla/5.0?(compatible;?MSIE?8.0;?Windows?NT?6.0;?Trident/4.0;?WOW64;?Trident/4.0;?SLCC2;?.NET?CLR?2.0.50727;?.NET?CLR?3.5.30729;?.NET?CLR?3.0.30729;?.NET?CLR?1.0.3705;?.NET?CLR?1.1.4322)",

"Mozilla/4.0?(compatible;?MSIE?7.0b;?Windows?NT?5.2;?.NET?CLR?1.1.4322;?.NET?CLR?2.0.50727;?InfoPath.2;?.NET?CLR?3.0.04506.30)",

"Mozilla/5.0?(Windows;?U;?Windows?NT?5.1;?zh-CN)?AppleWebKit/523.15?(KHTML,?like?Gecko,?Safari/419.3)?Arora/0.3?(Change:?287?c9dfb30)",

"Mozilla/5.0?(X11;?U;?Linux;?en-US)?AppleWebKit/527+?(KHTML,?like?Gecko,?Safari/419.3)?Arora/0.6",

"Mozilla/5.0?(Windows;?U;?Windows?NT?5.1;?en-US;?rv:1.8.1.2pre)?Gecko/20070215?K-Ninja/2.1.1",

"Mozilla/5.0?(Windows;?U;?Windows?NT?5.1;?zh-CN;?rv:1.9)?Gecko/20080705?Firefox/3.0?Kapiko/3.0",

"Mozilla/5.0?(X11;?Linux?i686;?U;)?Gecko/20070322?Kazehakase/0.4.5",

"Mozilla/5.0?(X11;?U;?Linux?i686;?en-US;?rv:1.9.0.8)?Gecko?Fedora/1.9.0.8-1.fc10?Kazehakase/0.5.6",

"Mozilla/5.0?(Windows?NT?6.1;?WOW64)?AppleWebKit/535.11?(KHTML,?like?Gecko)?Chrome/17.0.963.56?Safari/535.11",

"Mozilla/5.0?(Macintosh;?Intel?Mac?OS?X?10_7_3)?AppleWebKit/535.20?(KHTML,?like?Gecko)?Chrome/19.0.1036.7?Safari/535.20",

"Opera/9.80?(Macintosh;?Intel?Mac?OS?X?10.6.8;?U;?fr)?Presto/2.9.168?Version/11.52",

"Mozilla/5.0?(Windows?NT?6.1;?WOW64)?AppleWebKit/536.11?(KHTML,?like?Gecko)?Chrome/20.0.1132.11?TaoBrowser/2.0?Safari/536.11",

"Mozilla/5.0?(Windows?NT?6.1;?WOW64)?AppleWebKit/537.1?(KHTML,?like?Gecko)?Chrome/21.0.1180.71?Safari/537.1?LBBROWSER",

"Mozilla/5.0?(compatible;?MSIE?9.0;?Windows?NT?6.1;?WOW64;?Trident/5.0;?SLCC2;?.NET?CLR?2.0.50727;?.NET?CLR?3.5.30729;?.NET?CLR?3.0.30729;?Media?Center?PC?6.0;?.NET4.0C;?.NET4.0E;?LBBROWSER)",

"Mozilla/4.0?(compatible;?MSIE?6.0;?Windows?NT?5.1;?SV1;?QQDownload?732;?.NET4.0C;?.NET4.0E;?LBBROWSER)",

"Mozilla/5.0?(Windows?NT?6.1;?WOW64)?AppleWebKit/535.11?(KHTML,?like?Gecko)?Chrome/17.0.963.84?Safari/535.11?LBBROWSER",

"Mozilla/4.0?(compatible;?MSIE?7.0;?Windows?NT?6.1;?WOW64;?Trident/5.0;?SLCC2;?.NET?CLR?2.0.50727;?.NET?CLR?3.5.30729;?.NET?CLR?3.0.30729;?Media?Center?PC?6.0;?.NET4.0C;?.NET4.0E)",

"Mozilla/5.0?(compatible;?MSIE?9.0;?Windows?NT?6.1;?WOW64;?Trident/5.0;?SLCC2;?.NET?CLR?2.0.50727;?.NET?CLR?3.5.30729;?.NET?CLR?3.0.30729;?Media?Center?PC?6.0;?.NET4.0C;?.NET4.0E;?QQBrowser/7.0.3698.400)",

"Mozilla/4.0?(compatible;?MSIE?6.0;?Windows?NT?5.1;?SV1;?QQDownload?732;?.NET4.0C;?.NET4.0E)",

"Mozilla/4.0?(compatible;?MSIE?7.0;?Windows?NT?5.1;?Trident/4.0;?SV1;?QQDownload?732;?.NET4.0C;?.NET4.0E;?360SE)",

"Mozilla/4.0?(compatible;?MSIE?6.0;?Windows?NT?5.1;?SV1;?QQDownload?732;?.NET4.0C;?.NET4.0E)",

"Mozilla/4.0?(compatible;?MSIE?7.0;?Windows?NT?6.1;?WOW64;?Trident/5.0;?SLCC2;?.NET?CLR?2.0.50727;?.NET?CLR?3.5.30729;?.NET?CLR?3.0.30729;?Media?Center?PC?6.0;?.NET4.0C;?.NET4.0E)",

"Mozilla/5.0?(Windows?NT?5.1)?AppleWebKit/537.1?(KHTML,?like?Gecko)?Chrome/21.0.1180.89?Safari/537.1",

"Mozilla/5.0?(Windows?NT?6.1;?WOW64)?AppleWebKit/537.1?(KHTML,?like?Gecko)?Chrome/21.0.1180.89?Safari/537.1",

"Mozilla/5.0?(iPad;?U;?CPU?OS?4_2_1?like?Mac?OS?X;?zh-cn)?AppleWebKit/533.17.9?(KHTML,?like?Gecko)?Version/5.0.2?Mobile/8C148?Safari/6533.18.5",

"Mozilla/5.0?(Windows?NT?6.1;?Win64;?x64;?rv:2.0b13pre)?Gecko/20110307?Firefox/4.0b13pre",

"Mozilla/5.0?(X11;?Ubuntu;?Linux?x86_64;?rv:16.0)?Gecko/20100101?Firefox/16.0",

"Mozilla/5.0?(Windows?NT?6.1;?WOW64)?AppleWebKit/537.11?(KHTML,?like?Gecko)?Chrome/23.0.1271.64?Safari/537.11",

"Mozilla/5.0?(X11;?U;?Linux?x86_64;?zh-CN;?rv:1.9.2.10)?Gecko/20100922?Ubuntu/10.10?(maverick)?Firefox/3.6.10"

]

#?random.choice返回列表的隨機項

user_agent?=?random.choice(user_agents)

return?user_agent

#?random.randint產生隨機整數

time.sleep(2?+?float(random.randint(1,?100))?/?20)

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