data crawling from website. Result changes multiple times - python-2.7

Question

In this code I am trying to fetch the some attribute of mobile phone but I am unable to get the information. Though those attribute are present in the url's.
import requests,re
from bs4 import BeautifulSoup
from time import sleep
import urllib2
def demo(url):
header = {'user-agent': 'Mozilla/5.0 (Windows NT 6.2; Win64; x64)', }
array = []
camera_review = processor_review = battery_review = display_review = verdict = pro = con = ""
request=""
while True:
try:
#request=urllib2.urlopen(url)
request = requests.get(url, "headers=header").text
break
except requests.exceptions.ConnectionError:
print " connection error"
sleep(15)
############################################################################################################
soup = BeautifulSoup(request, "html.parser")
try:
pros = soup.find("ul", attrs={"class": "for_list_overview"})
for i in pros.find_all('li'):
temp= i.find('span').contents[0]
pro += temp + "\n"
except AttributeError:
print "pro not found"
#################################################################################################################
try:
cons = soup.find("ul", attrs={"class": "against_list_overview"})
for j in cons.find_all('li'):
temp = j.find('span').contents[0]
con +=temp + "\n"
print con
except AttributeError:
print "con not available"
################################################################################################################
try:
dac = soup.find("div", attrs={"class": "overview_specs_green_box display_none"})
for k in dac.find_all(text=re.compile('camera')):
camera_review +=k
print camera_review
except AttributeError:
print "camera review not available"
#print k
#################################################################################
try:
for l in dac.find_all(text=re.compile('processor')):
processor_review +=l
print processor_review
except AttributeError:
print "processor review not available"
#print l
#################################################################################
try:
for m in dac.find_all(text=re.compile('battery')):
battery_review +=m
print battery_review
except AttributeError:
print "battery review not available"
#print m
#################################################################################
try:
for n in dac.find_all(text=re.compile('display')):
display_review +=n
print display_review
except AttributeError:
print "display review not available"
##############################################################################################################
try:
vid = soup.find("div", attrs={"style": "font-weight:400 !important;color: #3c3c3c;"})
for o in vid.find_all(text=re.compile('a')):
verdict +=o
if len(verdict) == 0:
temp = 'na'
verdict +=temp
print verdict
except AttributeError:
print "verdict Attribute Error"
url=["http://www.91mobiles.com/xiaomi-redmi-note-3-32gb-price-in-india",
"http://www.91mobiles.com/blackberry-priv-price-in-india",
"http://www.91mobiles.com/oneplus-3-price-in-india",
"http://www.91mobiles.com/coolpad-note-5-price-in-india",
"http://www.91mobiles.com/vivo-v3-max-price-in-india",
"http://www.91mobiles.com/oppo-f1s-price-in-india"]
i=0
while i<len(url):
demo(url[i])
print "###################################################################################################"
print "###################################################################################################"
i+=1
Each time I run the code output gets changed.