Selenium找不到返回None或[]的元素

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

driver = webdriver.Chrome()
driver.get("http://example.com")

try:
    element = WebDriverWait(driver, 10).until(
        EC.presence_of_element_located((By.ID, "myDynamicElement"))
    )
finally:
    driver.quit()

# 错误的定位器示例
element = driver.find_element(By.ID, "non_existent_id")  # 这将返回None

# 正确的定位器示例
element = driver.find_element(By.ID, "correct_id")

element = WebDriverWait(driver, 10).until(
    EC.presence_of_element_located((By.XPATH, "//div[@class='dynamic-content']"))
)

# 切换到iframe
driver.switch_to.frame("iframe_name")

# 切换回主文档
driver.switch_to.default_content()

# 切换窗口
driver.switch_to.window(driver.window_handles[1])

WebDriverWait(driver, 10).until(EC.url_changes("http://example.com"))