Selenium Testing in Firefox under session id - python-3.x

Question

E
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ERROR: test_LoginCorrect (__main__.LoginCorrect)
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Traceback (most recent call last):
File "demo.py", line 12, in test_LoginCorrect
driver= webdriver.Remote(desired_capabilities=DesiredCapabilities().FIREFOX,command_executor='http://0.0.0.0:4444')
File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/remote/webdriver.py", line 156, in __init__
self.start_session(capabilities, browser_profile)
File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/remote/webdriver.py", line 248, in
start_session
self.session_id = response['sessionId']
TypeError: string indices must be integers
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Ran 1 test in 20.878s
//Formatting is not properly done
FAILED (errors=1)
My test case file :
import unittest
from selenium import webdriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
class LoginCorrect(unittest.TestCase):
def setUp(self):
self.driver = webdriver.Remote(command_executor='http://0.0.0.0:4444/wd/hub', desired_capabilities=DesiredCapabilities.FIREFOX)
def test_LoginCorrect(self):
user ="shubh"
pwd= "sha123#56su"
driver= webdriver.Remote(desired_capabilities=DesiredCapabilities().FIREFOX,command_executor='http://0.0.0.0:4444')
driver.get("http://0.0.0.0:8000/login")
elem = driver.find_element_by_id("id_username")
elem.send_keys(user)
elem = driver.find_element_by_id("id_password")
elem.send_keys(pwd)
driver.find_element_by_class_name('btn-block').click()
def tearDown(self):
self.driver.quit()
if __name__ == '__main__':
unittest.main()
My machine has Linux 16.04LTS and selenium 3.3.0
Can somebody figure out this problem.