在调用FindElement之前确定是否存在Angular

from selenium import webdriver
from selenium.webdriver.chrome.service import Service
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.common.action_chains import ActionChains
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.common.alert import Alert
from selenium.webdriver.common.proxy import Proxy, ProxyType
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
from selenium.webdriver.firefox.options import Options
from selenium.webdriver.firefox.service import Service
from selenium.webdriver.firefox.firefox_binary import FirefoxBinary
from selenium.webdriver.firefox.firefox_profile import FirefoxProfile
from selenium.webdriver.edge.service import Service
from selenium.webdriver.edge.options import Options
from selenium.webdriver.ie.service import Service
from selenium.webdriver.opera.service import Service
from selenium.webdriver.opera.options import Options
from selenium.webdriver.safari.service import Service
from selenium.webdriver.safari.options import Options

from selenium.webdriver.remote.webdriver import WebDriver as RemoteWebDriver
from selenium.webdriver.firefox.webdriver import WebDriver as FirefoxWebDriver
from selenium.webdriver.chrome.webdriver import WebDriver as ChromeWebDriver
from selenium.webdriver.ie.webdriver import WebDriver as IeWebDriver
from selenium.webdriver.opera.webdriver import WebDriver as OperaWebDriver
from selenium.webdriver.edge.webdriver import WebDriver as EdgeWebDriver
from selenium.webdriver.common.by import By
from selenium.webdriver.remote.webelement import WebElement
from selenium.webdriver.firefox.webelement import FirefoxWebElement
from selenium.webdriver.chrome.webelement import ChromeWebElement
from selenium.webdriver.ie.webelement import IeWebElement
from selenium.webdriver.opera.webelement import OperaWebElement
from selenium.webdriver.edge.webelement import EdgeWebElement
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support.expected_conditions import (
    presence_of_element_located,
    staleness_of,
    visibility_of_element_located,
    visibility_of,
    invisibility_of_element_located,
    invisibility_of_element,
    element_to_be_clickable,
    element_to_be_selected,
    element_selection_state_to_be,
    element_located_selection_state_to_be,
    element_located_to_be_selected,
    element_to_be_located,
    frame_to_be_available_and_switch_to_it,
    new_window_is_opened,
    number_of_windows_to_be,
    alert_is_present,
)
from selenium.webdriver.remote.file_detector import LocalFileDetector
from selenium.webdriver.remote.command import Command
from selenium.webdriver.common.alert import Alert
from selenium.webdriver.common.touch_actions import TouchActions
from selenium.webdriver.common.keyboard import Keyboard
from selenium.webdriver.common.proxy import Proxy
from selenium.webdriver.common.proxy import ProxyType
from selenium.webdriver.common.service import Service
from selenium.webdriver.common.html5.application_cache import ApplicationCache
from selenium.webdriver.common.html5.database_storage import Database
from selenium.webdriver.common.html5.location import Location
from selenium.webdriver.common.html5.shared_worker import SharedWorker
from selenium.webdriver.common.html5.web_storage import WebStorage
from selenium.webdriver.common.html5.application_cache import ApplicationCache
from selenium.webdriver.common.html5.database_storage import Database
from selenium.webdriver.common.html5.location import Location
from selenium.webdriver.common.html5.shared_worker import SharedWorker
from selenium.webdriver.common.html5.web_storage import WebStorage

from selenium.webdriver.common.alert import Alert
from selenium.webdriver.common.touch_actions import TouchActions
from selenium.webdriver.common.action_chains import ActionChains
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.common.by import By
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
from selenium.webdriver.common.proxy import Proxy, ProxyType
from selenium.webdriver.common.service import Service

import time


# 在调用FindElement之前确定是否存在Angular的函数
def check_angular(driver):
    from selenium.webdriver.chrome.service import Service

    # 创建一个新的ChromeDriver服务
    chrome_service = Service(executable_path='/path/to/chromedriver')
    chrome_service.start()

    # 创建一个Chrome浏览器实例
    chrome_options = Options()
    chrome_options.add_argument('--headless')
    driver = webdriver.Chrome(service=chrome_service, options=chrome_options)

    # 加载网页
    driver.get('https://www.example.com')

    # 使用NgZone服务检测Angular的状态
    def on_angular_stable():
        # 执行元素查找操作
        element = driver.find_element(By.XPATH, '//div[@class="example"]')
        print(element.text)

    # 创建一个NgZone实例
    ng_zone = driver.execute_async_script('''
        var callback = arguments[arguments.length - 1];
        var ngZone = new NgZone({enableLongStackTrace: false});
        ngZone.onStable.subscribe(function () {
            callback();
        });
    ''')

    # 监听Angular的状态
    ng_zone.callFunction(on_angular_stable)
    time.sleep(1)

    # 关闭浏览器实例和服务
    driver.quit()
    chrome_service.stop()


# 测试函数
def test_check_angular():
    driver = None

    try:
        # 检查Angular
        check_angular(driver)
    finally:
        if driver:
            driver.quit()


# 运行测试函数
test_check_angular()