user1="myusername"
password1="password"
url="https://reg.usps.com/login?app=MyUSPS"
browser.get(url)

username = browser.find_element_by_name('username')
username.send_keys(user1)
sleep(5)
password = browser.find_element_by_name('password')
password.send_keys(passwd1)
sleep(5)
browser.find_element_by_id('btn-submit').click()
sleep(3)

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

options = webdriver.ChromeOptions()
options.add_argument("start-maximized")
options.add_argument('disable-infobars')
driver=webdriver.Chrome(chrome_options=options, executable_path=r'C:UtilityBrowserDriverschromedriver.exe')
driver.get("https://reg.usps.com/login?app=MyUSPS")
WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//input[@class='form-control' and @id='username']"))).send_keys("Ankit")
driver.find_element_by_xpath("//input[@class='form-control' and @id='password']").send_keys("Ankit")
driver.find_element_by_xpath("//button[@class='btn btn-primary btn-lg btn-block' and @id='btn-submit']").click()