Read url with BeautifulSoup, urllib and write in csv file

gistfile1.txt

from BeautifulSoup import BeautifulSoup as BS
import urllib, urllib2, re
import csv

url = 'http://www.entreprises-aix.com/entreprises.php'
data = {"CaNum": "3246", "btn_rechercher": "RECHERCHER"}
data = urllib.urlencode(data)

req = urllib2.Request(url, data)
response = urllib2.urlopen(req)

html_code = response.read()

data_soup = BS(html_code);
#datas = data_soup.find_all('a') #attrs={"data-url"})
links = data_soup.findAll("a")
i = 0;

print links
try:
    with open('societes.csv', 'w') as fp:
        companies = csv.writer(fp,delimiter=';')
        companies.writerow(['email'])

        for anchor in links:
            companies.writerow([anchor['href']])
    
        fp.close()            

finally:    
    response.close()