[Fixed]-Login instance in the setup method of selenium

Each instance of Selenium is independent and starts with a clean history and no cookie. You could simply implement a login page object:

class CreateListingTest(unittest.TestCase):
    def setUp(self):
        self.driver = webdriver.Firefox()
        PageLogin(self.driver) \
          .visit() \
          .login(name, password)

    def test_createListing(self):
        driver = self.driver
        *** continue with test method ***

class PageLogin(object):

    url = "http://127.0.0.1:8000/"

    def __init__(self, driver):
      self.driver = driver

    def visit(self):
        self.driver.get(self.url)
        ...
        return self

    def login(self, name, password):
        ...
        return self

    def logout(self):
        ...
        return self