How do I load session and cookies from Selenium browser to requests library in Python?

First you have to get the cookies from your driver instance:

cookies = driver.get_cookies()

This returns cookie dictionaries for your session.

Next, set those cookies in requests:

s = requests.Session()
for cookie in cookies:
    s.cookies.set(cookie['name'], cookie['value'])

You can use 3rd party package like selenium-requests or requestium. They provide function to share cookies between requests and selenium.