Selenium webdriver python未在密码字段中键入

Question

我做了这个代码，它的工作，唯一的问题是当输入密码字段。什么都没出现。你能帮帮我吗？你知道吗

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
import threading

userStr = '555555'
passwordStr = '555555'

browser = webdriver.Chrome()
browser.get(('https://www30.mercantilbanco.com/olb/Login'))

username = browser.find_element_by_css_selector('#userId')
username.send_keys(userStr)

password = browser.find_element_by_css_selector('#password')
username.send_keys(passwordStr)