platform_login_selenium.py

import os

# make venv and pip install selenium
from selenium import webdriver
from selenium.webdriver.common.keys import Keys

# set your codechalleng.es username and password in venv/bin/activate, then source it
user = os.getenv('PB_USER')
password = os.getenv('PB_PW')

driver = webdriver.Chrome()

base_url = 'https://codechalleng.es'
login_url = f'{base_url}/login/'

driver.get(login_url)

driver.find_element_by_name('username').send_keys(user)
driver.find_element_by_name('password').send_keys(password + Keys.RETURN)

# I am logged in, let go to a Bite
bite_url = f'{base_url}/bites/101'
driver.get(bite_url)

# do your thing
html = driver.page_source

Thanks!