requests_login.py

import requests
from bs4 import BeautifulSoup

headers = {
    'user-agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36'
}

login_data = {
    'name': '<username>',
    'pass': '<password>',
    'form_id': 'new_login_form',
    'op': 'Login'
}

with requests.Session() as s:
    url = 'https://www.codechef.com/'
    r = s.get(url, headers=headers)
    soup = BeautifulSoup(r.content, 'html5lib')
    login_data['form_build_id'] = soup.find('input', attrs={'name': 'form_build_id'})['value']
    r = s.post(url, data=login_data, headers=headers)
    print(r.content)

I'm getting an error in line 18,
Couldn't find a tree builder with the features you requested: html5lib. Do you need to install a parser library?
can you help me out??

Try this command in terminal: pip install html5ib

@uddeshyy You better make use of cookies in the response . You can use status codes but Status codes are completely dependent on how the website responds. If the website giving 200 response code for both valid and invalid login then you can’t use. If Incase giving 400 for invalid and 200 for valid then there is change to use it as a key for success login.

@uminostech1089 you need to send the request the same way, the browser sending to the server. Use fidler or any http network debugging tools to read how the website is sending the requests to the server