import requests
from bs4 import BeautifulSoup

s = requests.session()

validation_url = 'https://bankrot.fedresurs.ru/DebtorsSearch.aspx'

form_response = s.post(validation_url)

soup = BeautifulSoup(form_response.content, 'html.parser')
viewstate = soup.find('input', id='__VIEWSTATE').get('value')
viewgenerator = soup.find('input', id='__VIEWSTATEGENERATOR').get('value')
previouspage = soup.find('input', id='__PREVIOUSPAGE').get('value')
# print(previouspage)


item_request_body = {
    '__EVENTTARGET': "",
    '__EVENTARGUMENT': "",
    '__VIEWSTATE': viewstate,
    '__VIEWSTATEGENERATOR': viewgenerator,
    '__PREVIOUSPAGE': '',
    'ctl00$PrivateOffice1$tbLogin': "",
    'ctl00$PrivateOffice1$tbPassword': "",
    'ctl00$PrivateOffice1$cbRememberMe': "on",
    'ctl00$PrivateOffice1$tbEmailForPassword': "",
    'ctl00_PrivateOffice1_RadToolTip1_ClientState': "",
    'ctl00$DebtorSearch1$inputDebtor': "поиск",
    'ctl00$cphBody$rblDebtorType': "Persons",
    'ctl00$cphBody$tbOrgName': "",
    'ctl00$cphBody$tbOrgAddress': "",
    'ctl00$cphBody$ucOrgRegionList$ddlBoundList': "",
    'ctl00$cphBody$ucOrgCategoryList$ddlBoundList': "",
    'ctl00$cphBody$OrganizationCode1$CodeTextBox': "",
    'ctl00$cphBody$tbPrsLastName': "Иванов",
    'ctl00$cphBody$tbPrsFirstName': "Иван",
    'ctl00$cphBody$tbPrsMiddleName': "",
    'ctl00$cphBody$tbPrsAddress': "",
    'ctl00$cphBody$ucPrsRegionList$ddlBoundList': "",
    'ctl00$cphBody$ucPrsCategoryList$ddlBoundList': "",
    'ctl00$cphBody$PersonCode1$CodeTextBox': "",
    'ctl00$cphBody$btnSearch.x': "48",
    'ctl00$cphBody$btnSearch.y': "14"
}
response = s.post(url=validation_url, data=item_request_body)
print(response)
print(form_response.url)
print(response.text)