Python implements random reading of text n rows of data

The work needs to determine whether a URL in a text to access the normal, and randomly get the n rows of the normal access to the URL data, my idea is: Read the text of each row of data, with Urlopen access, will return the URL of the status Code 200 to a list, get the length of the list, Use random to generate a random value as the list subscript to get the row data. The specific implementation is as follows:

1 ImportUrllib2,random2  fromSetsImportSet3 4 defget_responses (URL):5     Globalgood_list6     Globalbad_list7     if  notUrl.startswith ("http:"):8Http_url ="/ http"+URL9headers = {'user-agent':'mozilla/5.0 (Windows NT 5.1; rv:10.0.1) gecko/20100101 firefox/10.0.1',}Ten     Try: OneRequest = Urllib2. Request (Http_url, headers=headers) ARESP =Urllib2.urlopen (Request) -     PrintURL -     exceptUrllib2. Urlerror, E: the         Printe - bad_list.append (URL) -         return0 -  +Retcode =Resp.getcode () -     ifRetcode = = 200: + good_list.append (URL) A         #return 1 at     Else: - bad_list.append (URL) -         #return 0 -  - defreadFile (): -     Try: inurllist = Open (r'C:\Users\888\Desktop\urls.txt','R') -     exceptIOError: to         Print "file does not exist.\n" +      forIteminchurllist: -Item = Item.strip ('\ n') theR =get_responses (item) *  $ urllist.close ()Panax Notoginseng     Print "Total URLs:%d, good urls:%d, bad URLs:%d."% ((len (good_list) +Len ( bad_list)), Len (good_list), Len (bad_list)) -      the defWriteFile (linenum): +result = [] ALinelen =Len (good_list) the      whileLen (Set (Result)) <Int (linenum): +s = Random.randint (0,linelen-1) - result.append (Good_list[s]) $          $     #Put the Good_url in Goodurl.txt file -     Try: -Goodurl = Open (r'C:\Users\888\Desktop\goodurl.txt','w+') the     exceptIOError: -         Print "file does not exist.\n"Wuyi  the      forIteminchResult: -Goodurl.write (item+'\ n') Wu goodurl.close () -  About     Print "The mission is do, please check the Goodurl.txt file" $      - if __name__=="__main__":   -Good_list = [] -Bad_list = [] A ReadFile () +WriteFile (100)

Python implements random reading of text n rows of data