Python Selenium选择下拉表没有选择？

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

# 初始化浏览器驱动
driver = webdriver.Chrome()

# 打开目标网页
driver.get('你的网页URL')

try:
    # 等待下拉表单元素加载
    dropdown = WebDriverWait(driver, 10).until(
        EC.presence_of_element_located((By.ID, "dropdown_id"))
    )

    # 创建Select对象
    select = Select(dropdown)

    # 通过可见文本选择选项
    select.select_by_visible_text('选项文本')

    # 或者通过索引选择
    select.select_by_index(1)

    # 或者通过value属性选择
    select.select_by_value('option_value')

except Exception as e:
    print(f"发生错误: {e}")

finally:
    # 关闭浏览器
    driver.quit()