在selenium中使用数据提供程序时，将第一组数据作为空值获取

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

data_provider = [
    ['', 'password1'],
    ['username2', 'password2'],
    ['username3', 'password3']
]

driver = webdriver.Chrome()  # 使用Chrome浏览器驱动
wait = WebDriverWait(driver, 10)  # 设置等待时间为10秒

for data in data_provider:
    username = data[0]
    password = data[1]

    # 打开登录页面
    driver.get('https://example.com/login')

    # 输入用户名和密码
    username_input = wait.until(EC.presence_of_element_located((By.ID, 'username')))
    username_input.send_keys(username)
    password_input = wait.until(EC.presence_of_element_located((By.ID, 'password')))
    password_input.send_keys(password)

    # 提交表单
    submit_button = wait.until(EC.element_to_be_clickable((By.ID, 'submit')))
    submit_button.click()

    # 在这里进行空值获取的操作
    # ...

    # 关闭浏览器窗口
    driver.quit()