login_leetcode.py

import requests,json
from requests_toolbelt import MultipartEncoder

session = requests.Session()
user_agent = r'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36'

def login(username, password):
    url = 'https://leetcode.com'
    cookies = session.get(url).cookies
    for cookie in cookies:
        if cookie.name == 'csrftoken':
            csrftoken = cookie.value

    url = "https://leetcode.com/accounts/login"
        
    params_data = {
        'csrfmiddlewaretoken': csrftoken,
        'login': username,
        'password':password,
        'next': 'problems'
    }
    headers = {'User-Agent': user_agent, 'Connection': 'keep-alive', 'Referer': 'https://leetcode.com/accounts/login/', "origin": "https://leetcode.com"}
    m = MultipartEncoder(params_data)   

    headers['Content-Type'] = m.content_type
    session.post(url, headers = headers, data = m, timeout = 10, allow_redirects = False)
    is_login = session.cookies.get('LEETCODE_SESSION') != None
    return is_login