Python 3.x 我如何告诉我的python脚本等待；另存为；在执行下一个代码块之前，是否在chrome中弹出对话框？

我使用selenium和pyautogui从网站下载图片。我的代码的逻辑是使用selenium在我想要的链接页面中导航。通过使用pyautogui，我可以将它们结合起来，自动右键单击并下载图像（虽然不是很完美），然后输入文件名。我现在面临的问题是，如果保存图像的对话框需要很长时间才能弹出。Pyautogui不能等待它弹出，而只是盲目地输入它应该输入的文本。我很难找到这个，也很难找到一种方法来检测弹出的对话。我现在被这个问题困扰着。有没有什么方法可以让我的程序等待它在selenium中弹出？还是我必须使用另一个模块？在这种情况下，我可以使用什么模块

重现问题的代码：

import time

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 pyautogui as auto


driver = webdriver.Chrome()

urls = [  # Sample urls.
    'https://unsplash.com/photos/MAqmEdUCq4k',
    'https://unsplash.com/photos/s7PhRjUJNeA',
]

# Declaring img_xpath and x for loop counting.
img_xpath = '//*[@id="app"]/div/div[2]/div/div[1]/div[3]/div/div/button/div[2]/img'
x = 0

for url in urls:  # Loops through urls.
    x += 1
    time.sleep(2)
    driver.get(url)

    # Waits for the image element of the site to load.
    WebDriverWait(driver, 10).until(
        EC.presence_of_element_located((By.XPATH, img_xpath))
    )

    # Calculates current browser center relative to screen position.
    win_pos = driver.get_window_position()
    win_size = driver.get_window_size()
    bcs = [  # bcs stands for Browser Center on Screen.
        win_pos['x'] + int(win_size['width'] / 2),
        win_pos['y'] + int(win_size['height'] / 2),
    ]

    # Using pyautogui to save image.
    auto.moveTo(bcs[0], bcs[1])
    auto.click()
    time.sleep(1)
    auto.rightClick()
    auto.moveTo(bcs[0] + 25, bcs[1] + 35)
    auto.click()
    time.sleep(2)  # Comment out this line to reproduce the problem if your system is too fast.
    auto.typewrite(f'Sample_{str(x)}')
    auto.press('enter')
time.sleep(3)
driver.close()

额外说明。代码使用带有默认设置的Chrome浏览器

版本：

蟒蛇→ 3.8.5

皮奥图吉→ 0.9.50

硒→ 3.141.0

---

如果我问错了什么，我道歉。这是我在网站上的第一个问题。另外，我对python还是个新手。

我已经解决了这个问题。我使用了一个名为“pywinauto”的模块，并使用了应用程序模块。然后我们转到一个循环，使用connect（）方法连接到浏览器，并使用exists（）方法判断对话框是否存在。我将这两种方法都放在循环中，每秒钟左右更新一次。然后，一旦检测到对话框，我们将继续余下的过程。此模块还有其他方法来判断对话框是否存在以及是否位于屏幕顶部。但这个解决方案对我有效

守则：

import time

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 pyautogui as auto
from pywinauto.application import Application as App
import warnings  # Import module to remove warnings


driver = webdriver.Chrome()

urls = [  # Sample urls.
    'https://unsplash.com/photos/MAqmEdUCq4k',
    'https://unsplash.com/photos/s7PhRjUJNeA',
]

# Declaring img_xpath and x for loop counting.
img_xpath = '//*[@id="app"]/div/div[2]/div/div[1]/div[3]/div/div/button/div[2]/img'
x = 0

# Ignore UserWarning.
warnings.simplefilter('ignore', category=UserWarning)

for url in urls:  # Loops through urls.
    x += 1
    time.sleep(2)
    driver.get(url)

    # Waits for the image element of the site to load.
    WebDriverWait(driver, 10).until(
        EC.presence_of_element_located((By.XPATH, img_xpath))
    )

    # Declaring program path.
    chrome = r'C:\Program Files\Google\Chrome\Application\chrome.exe'

    # Calculates current browser center relative to screen position.
    win_pos = driver.get_window_position()
    win_size = driver.get_window_size()
    bcs = [  # bcs stands for Browser Center on Screen.
        win_pos['x'] + int(win_size['width'] / 2),
        win_pos['y'] + int(win_size['height'] / 2),
    ]

    # Using pyautogui to save image.
    auto.moveTo(bcs[0], bcs[1])
    auto.click()
    time.sleep(1)
    auto.moveTo(bcs[0], bcs[1])
    auto.rightClick()
    auto.moveTo(bcs[0] + 25, bcs[1] + 35)
    auto.click()
    y = 0
    while y != 10:
        y += 1
        time.sleep(1)
        app = App().connect(path=chrome)  # Connects script to Chrome.
        if app['Save As'].exists():  # Checks dialog box 'Save As' existence.
            auto.typewrite(f'Sample_{str(x)}')
            auto.press('enter')
            break

time.sleep(3)
driver.close()

附加说明。我已经对代码进行了一点重构，以便更流畅地工作。所有的预设和设置都差不多

pywinauto版本→ 0.6.8