temp.py

import requests, bs4, re

url = r'http://www.bing.com/images/search?q=scarlett+johansson&qft=%2Bfilterui%3Aimagesize-large'

r = requests.get(url)

soup = bs4.BeautifulSoup(r.content)

res = soup.findAll('div', {'class': 'dg_u'})

for div in res:
    a_elem = div.find('a')
    m_attr = a_elem.get('m')
    if m_attr:
        dirty_url = m_attr.split('oi:')[-1]
        pattern = "http:.*.jpg"
        matches = re.findall(pattern, dirty_url)
        if matches:
            cleaned_url = matches[0]
            print cleaned_url