Python-сообщество

 <input type="hidden" name="javax.faces.ViewState" id="javax.faces.ViewState" value="1005:-2001" autocomplete="off">

 import requests
from lxml import etree
url = 'url'
api = requests.get(url)
htmlparser = etree.HTMLParser()
tree = etree.parse(api.text, htmlparser)
javaViewState = tree.xpath('//*[@id="javax.faces.ViewState"]') #?????
print (javaViewState)

 import lxml.html
value = html.xpath('//input[@name="javax.faces.ViewState"]/@value')

 $ python  test.py 
['1005:-2001']