# import requests module
import requests
# create a session object
s = requests.Session()
# set username and password
s.auth = ('user', 'pass')
# update headers
s.headers.update({'x-test': 'true'})
# both 'x-test' and 'x-test2' are sent
s.get('https://httpbin.org / headers', headers ={'x-test2': 'true'})
# print object
print(s)