Python Selenium - 如何处理直到 WebDriverWait 完成后才显示的警报？

Question

目前我正在尝试自动化订单流程，并且在某些时候，如果最近下过订单，则会弹出一条警报，指出“客户已在 2 天内为这些相同的商品下订单。请检查对于重复项或选中覆盖重复顺序以继续。”

我尝试了以下方法来拦截该警报并允许脚本继续运行：

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support.ui import Select

from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.alert import Alert
from selenium.webdriver.support import expected_conditions as ExCon
from selenium.common.exceptions import TimeoutException, NoSuchElementException, NoAlertPresentException,\
     UnexpectedAlertPresentException

from oleaprocs import Order

"""
    Will put the following constants in their own file later
"""
GEN_NEXT_ID      = "cmdNext"

SHIP_DET_METH_ID = "cboAvailItemsShip"
SHIP_DET_NEXT_ID = "cmdNext"

ORDER_REP_ID     = "cboServiceRep"

EMAIL_ID         = "ctl00_ctl00_main_content_main_content_ctl00_txtEmail"
SEARCH_RESULT_ID = "ctl00_ctl00_main_content_main_content_ctl00_dgResults_ctl03_lnkCustName"
ADD_ORDER_ID     = "cmdAddNewOrder"

LOGIN_ID  = 'ctl00_ctl00_main_content_main_content_ctl00_UserName'
PASS_ID   = 'ctl00_ctl00_main_content_main_content_ctl00_password'
SIGNIN_ID = 'ctl00_ctl00_main_content_main_content_ctl00_SigninBtn'

PLACED_VIA  = 'Phone'
BILL_OPTION = 'Visa x1111'

username = 'user'
password = 'pass'

customer = 'user'
items    = {'Item1': '100', 'Item2': '125'} # One or many items - also noting quantity

# This setup will likely be steamlined to determine whose server to use, etc
driver = webdriver.Chrome()

driver.maximize_window()
driver.get("website-placeholder-for-security-reasons")

# Login will be separated out into a function, to allow for various logins
# log-in
driver.find_element_by_id(LOGIN_ID).send_keys(username)
driver.find_element_by_id(PASS_ID).send_keys(password)
driver.find_element_by_id(SIGNIN_ID).click()

driver.find_element_by_xpath('//a[text()="Customers"]').click()

# Type in search for user-email - separated to function later
search_email = driver.find_element_by_id(EMAIL_ID)
search_email.send_keys(customer)
search_email.send_keys(Keys.RETURN)

# Click the (hopefully) singular search result
driver.find_element_by_id(SEARCH_RESULT_ID).click()
#search_result = driver.find_element_by_id(SEARCH_RESULT_ID).click()
#search_result.click()

### Start creating new order ###

## Order Items ##

# Accept Customer Orders alert
"""
alert_obj = driver.switch_to.alert
alert_obj.accept()
"""
Alert(driver).accept()

# Click on "Add New Order"
driver.find_element_by_id(ADD_ORDER_ID).click()

order = Order(driver)

# Set Placed Via
placed_via = Select(driver.find_element_by_name('cboPlacedVia'))
placed_via.select_by_visible_text(PLACED_VIA) # could also set IDs in a dict

# Set Billing Option
bill_option = Select(driver.find_element_by_name('ctrlBillOption$cboBillOption'))
bill_option.select_by_visible_text(BILL_OPTION)

# Add items to order
order.add_items(items)

# Will likely do some assertions here at some point, for custom / printed items

driver.find_element_by_id('cmdNext').click()

## Shipping Details ##

# Select Shipping Method

# If similar order recently placed - confirm alert and try/except duplicate order override

# driver.implicitly_wait(2)

try:
    print("WebDriverWait - 2 seconds")
    WebDriverWait(driver, 2).until(ExCon.alert_is_present())
    Alert(driver).accept()
    print("Switching to Alert")
    #alert_dupe = driver.switch_to.alert
    # print(str(alert_dupe.text))
    # alert_dupe.accept()

except TimeoutException:
    print("Timeout")

except NoAlertPresentException:
    print("No Alert Present")

except UnexpectedAlertPresentException:
    print("Unexpected alert, yo!")

try:
    driver.find_element_by_id('chkDuplicateOrderOverride').click()

except NoSuchElementException:
    print("No duplicate order detected")


# Continue
driver.find_element_by_id('cmdNext').click()

## Order Group Details ##

# Check for Authorize button (I could bypass this when I implement "order_type" later
try:
    driver.find_element_by_id('cmdAuthorize').click()
except NoSuchElementException:
    print("No Authorize Element Found - This payment method does not require authorization")

driver.find_element_by_id('cmdPlaceOrder').click()

以及引用的其他文件：

from selenium import webdriver
from selenium.webdriver.common.keys import Keys

"""
    Order will be used to keep track of the state of an order throughout
    the order-process. This can include things like the order total, items
    included, and can even get as complicated as 1:1 mirroring all of the
    details of an order. This will depend on our requirements.
"""
class Order(object):

    def __init__(self, driver):
        self.driver = driver

        # self.product_name_field = self.driver.find_element_by_id('txtProductName')
        # self.quantity_field = self.driver.find_element_by_id('txtQuantity')
        # self.add_item_button = self.driver.find_element_by_id('cmdAddSaveItem')


    # Add items to an order
    def add_items(self, items):
        """
            Will need to make the quantity check in here.
        """
        # product_name_field = self.driver.find_element_by_id('txtProductName')
        # quantity_field = self.driver.find_element_by_id('txtQuantity')
        # add_item_button = self.driver.find_element_by_id('cmdAddSaveItem')

        """
            Cannot simply one-time set the above because of the references
            going stale x_x - need to see if I can ignore stale-references.
        """
        for item, quantity in items.items():
            product_name_field = self.driver.find_element_by_id('txtProductName')
            product_name_field.send_keys(item)
            product_name_field.send_keys(Keys.TAB)

            quantity_field = self.driver.find_element_by_id('txtQuantity')
            quantity_field.send_keys(quantity)
            quantity_field.send_keys(Keys.TAB)

            add_item_button = self.driver.find_element_by_id('cmdAddSaveItem')
            add_item_button.click()

我对上一个警报可能不会释放资源进行了评论...我有以下代码早一点处理一个 总是 弹出的警报，所以我不必try那个：

alert_obj = driver.switch_to.alert
alert_obj.accept()

我在这里使用driver.switch_to.alert 变体，因为我在早期代码中尝试了两种变体，但均未奏效。

当代码到达WebDriverWait(drive, 2)... 时，基本上会发生什么，浏览器会坐在那里等待 2 秒，然后会弹出警报。我尝试了各种任意长度的时间，它总是会等待那个时间，然后显示警报。我觉得我在这里被拖了:|

这是发生这种情况后我收到的错误信息：

Traceback (most recent call last):
  File "C:\Users\user\Documents\Projects\Selenium\proj.py", line 136, in <module>
    driver.find_element_by_id('cmdAuthorize').click()
  File "C:\Python\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 353, in find_element_by_id
    return self.find_element(by=By.ID, value=id_)
  File "C:\Python\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 957, in find_element
    'value': value})['value']
  File "C:\Python\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 314, in execute
    self.error_handler.check_response(response)
  File "C:\Python\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 241, in check_response
    raise exception_class(message, screen, stacktrace, alert_text)
selenium.common.exceptions.UnexpectedAlertPresentException: Alert Text: None
Message: unexpected alert open: {Alert text : Customer has placed an order for these same items within 2 days. Please check for duplicates or check Override Duplicate Order to continue.}
  (Session info: chrome=66.0.3359.181)
  (Driver info: chromedriver=2.38.552522 (437e6fbedfa8762dec75e2c5b3ddb86763dc9dcb),platform=Windows NT 10.0.16299 x86_64)

知道为什么会发生这种情况吗？如果我没记错的话，我不相信我们真的有任何警报也有复选框或输入，所以我不会 100% 反对仅仅 100% 阻止警报被 Selenium 确认（或自动接受它们），但如果可以的话，我想避免这种情况。

如果最近没有下订单（或者我使用不同的帐户一遍又一遍地测试订单创建），代码运行完全正常，并且一直正确下订单。

从添加项目（就在有问题的页面之前）开始的手动步骤是：

1) 输入商品名称，然后输入商品数量 2）对“项目”字典中的每个项目执行此操作 3）点击下一步按钮 4) 带有运输选项的下一页“装载” 5) 如果最近下订单会出现问题——WebDriverWait 似乎正在停止页面的加载？似乎是这种情况，因为警报直到 WebDriverWait 时间用完后才会显示。

在告诉 Selenium 点击下一步按钮进入下一页后，我并没有真正做任何特别的事情。与之前的“点击下一个按钮”操作没有什么不同，并且该页面的行为实际上应该与其他页面没有任何不同 - 即使警报显然只是没有它 x_x

Answer 1

在警报检查之前我没有“单击下一步按钮”——直到之后我尝试提交运输详细信息首先才弹出警报>。在警报检查失败后它似乎继续执行进一步步骤的原因。

孩子们，请事先概述流程。