ptt

# -*- coding: utf-8 -*-
import mechanize
url = 'http://web.expasy.org/cgi-bin/peptide_mass/peptide-mass.pl?P35225'
br  = mechanize.Browser(factory=mechanize.RobustFactory())
br.set_handle_robots(False)
br.open(url)

br.select_form(nr=0)
br.form['protein']     = 'P35225'
br.form['mandatory']   = ''
br.form['reagents']    = ['nothing (in reduced form)', ]
br.form['mplus']       = ['mh',]
br.form['masses']      = ['monoisotopic',]
br.form['enzyme']      = ['Trypsin',]
br.form['MC']          = ['0',]
br.form['minmass']     = ['500',]
br.form['maxmass']     = ['unlimited',]
br.form['order']       = ['mass',]
br.form['modification']= ['on',]
page2 = br.submit()

savefile = open('form.html', 'w')
HTML     = page2.read()
savefile.write(HTML)
savefile.close()