How to select random values from the list and perform a loop test for 200 times?

from random import Random
from selenium import webdriver
import time
from selenium.webdriver.common.keys import Keys  
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support.ui import Select

driver = webdriver.Chrome('chromedriver')
driver.get('https://devbusiness.tunai.io/login')
time.sleep(2)
driver.maximize_window()

# Create variables for login credentials.
username = driver.find_element(By.NAME, "loginUsername");
username.send_keys("kevin@tunai");

password = driver.find_element(By.NAME, "loginPassword");
password.send_keys("xxxxx");

login =