import requests
import bs4 as bs

login_url = "__withheld__"
target_url = "__withheld__"

login_data = { "username": "my_username", "password": "my_password"}

with requests.Session() as s:
    page = s.get(login_url)
    page_login = s.post(login_url, data = login_data)
    page = s.get(target_url)
    final_page = bs.BeautifulSoup(page.content, 'lxml')
    print(final_page.title)

<input name="username" type="text" id="username" class="metro-input" placeholder="Username" value="">
<span id="username-error" class=""></span>
<label class="ie789Only"> Password</label>
<input name="password" type="password" id="password" class="metro-input" placeholder="Password">
<input type="submit" name="button1" value="Sign in" id="button1" class="metro-button">

import requests
import bs4 as bs
username = 'username of the site'
password = 'password of the site'

req = requests.get(login_url, auth=(username, password))
final_page = bs.BeautifulSoup(req.content, 'lxml')
print(final_page.title)