import requests

with requests.session() as c:
    url = 'https://www.stock-analysis-on.net/User/Sign-in/%252F'
    USERNAME = 'address@example.com'
    PASSWORD = '*********'
r = c.get(url)
login_data = dict(username=USERNAME, password=PASSWORD, next='/')
cookie = {'PHPSESSID': requests.utils.dict_from_cookiejar(c.cookies) ['PHPSESSID']}
r = c.post(url, data=login_data, cookies=cookie, headers={"referer": "https://www.stock-analysis-on.net/User/Sign-in/%252F"})
page = c.get('https://www.stock-analysis-on.net')
print(page.content)