Why I can log in amazon website using python mechanize, but not requests or urllib2

Why I can log in amazon website using python mechanize, but not requests
or urllib2

I can use the following piece of python code found from here to log into
amazon.com:
import mechanize
br = mechanize.Browser()
br.set_handle_robots(False)
br.addheaders = [("User-agent", "Mozilla/5.0 (X11; U; Linux i686; en-US;
rv:1.9.2.13) Gecko/20101206 Ubuntu/10.10 (maverick) Firefox/3.6.13")]
sign_in = br.open('https://www.amazon.com/gp/sign-in.html')
br.select_form(name="sign-in")
br["email"] = 'test@test.com'
br["password"] = 'test4test'
logged_in = br.submit()
orders_html =
br.open("https://www.amazon.com/gp/css/history/orders/view.html?orderFilter=year-%s&startAtIndex=1000"
% 2013)
But following two pieces using requests module and urllib2 do not work.
import requests
import sys
username = "test@test.com"
password = "test4test"
login_data = ({
'email' : fb_username,
'password' : fb_password,
'flex_password': 'true'})
url = 'https://www.amazon.com/gp/sign-in.html'
agent ={'User-agent', 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4)
AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.57 Safari/537.1'}
session = requests.session(config={'verbose': sys.stderr}, headers = agent)
r = session.get('http://www.amazon.com')
r1 = session.post(url, data=login_data, cookies=r.cookies)
r2 =
session.post("https://www.amazon.com/gp/css/history/orders/view.html?orderFilter=year-2013&startAtIndex=1000",
cookies = r1.cookies)
#
import urllib2
import urllib
import cookielib
amazon_username = "test@test.com"
amazon_password = "test4test"
url = 'https://www.amazon.com/gp/sign-in.html'
cookie = cookielib.CookieJar()
login_data = urllib.urlencode({'email' : amazon_username, 'password' :
amazon_password,})
opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cookie))
opener.addheaders = [('User-agent', 'Mozilla/5.0 (Macintosh; Intel Mac OS
X 10_7_4) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.57
Safari/537.1')]
opener.open('www.amazon.com')
response = opener.open(url, login_data)
response =
opener.open("https://www.amazon.com/gp/css/history/orders/view.html?orderFilter=year-%s&startAtIndex=1000"
% 2013, login_data)
What did I do wrong in posting the amazon log in form? This is the first
time I post a form. Any help is appreciated.
I prefer to use urllib2 or requests because all my other code are using
these two modules.
Moreover, can any body comment on the speed performance between mechanize,
requests and urllib2, and other advantage of mechanize over the other two?