>要求是：使用用户名/密码凭据登录主页。登录完成后，将显示新页面。在新页面中，有一个下拉按钮。从下拉列表中选择一个值并拍摄页面快照。
from selenium import webdriver
from selenium.webdriver.firefox.options import Options
from selenium.webdriver.support.ui import Select
import time
options = Options()
options.headless = True
driver = webdriver.Firefox(options=options)
driver.get('url_to_page')
driver.find_element_by_id("username").send_keys("admin")
driver.find_element_by_id ("password").send_keys("admin")
driver.find_element_by_id("submit").click()
firefox_elem = driver.find_element_by_tag_name('html') --> login to main page is working fine
******<missing piece: How to select a value from dropdown in next page>******
firefox_elem.screenshot('test.png')
下面是需要选择的按钮，
<div id="ember8992" class="ember-view btn-group pull-left">
<button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" rel="tooltip" data-original-title="" data-bindattr-168="168">
<script id="metamorph-126-start" type="text/x-placeholder"></script>Last 1 hour<script id="metamorph-126-end" type="text/x-placeholder"></script>
<script id="metamorph-127-start" type="text/x-placeholder"></script><script id="metamorph-127-end" type="text/x-placeholder">
</script> <span class="caret"></span>
</button>
<ul class="dropdown-menu">
<script id="metamorph-137-start" type="text/x-placeholder"></script><script id="metamorph-128-start" type="text/x-placeholder"></script>
<li><a href="#" data-ember-action="169"><script id="metamorph-138-start" type="text/x-placeholder"></script>Last 1 hour<script id="metamorph-138-end" type="text/x-placeholder"></script></a></li>
<script id="metamorph-128-end" type="text/x-placeholder"></script><script id="metamorph-129-start" type="text/x-placeholder"></script>
<li><a href="#" data-ember-action="170"><script id="metamorph-139-start" type="text/x-placeholder"></script>Last 2 hours<script id="metamorph-139-end" type="text/x-placeholder"></script></a></li>
<script id="metamorph-129-end" type="text/x-placeholder"></script><script id="metamorph-130-start" type="text/x-placeholder"></script>
<li><a href="#" data-ember-action="171"><script id="metamorph-140-start" type="text/x-placeholder"></script>Last 4 hours<script id="metamorph-140-end" type="text/x-placeholder"></script></a></li>
<script id="metamorph-130-end" type="text/x-placeholder"></script><script id="metamorph-131-start" type="text/x-placeholder"></script>
<li><a href="#" data-ember-action="172"><script id="metamorph-141-start" type="text/x-placeholder"></script>Last 12 hours<script id="metamorph-141-end" type="text/x-placeholder"></script></a></li>
<script id="metamorph-131-end" type="text/x-placeholder"></script><script id="metamorph-132-start" type="text/x-placeholder"></script>
<li><a href="#" data-ember-action="173"><script id="metamorph-142-start" type="text/x-placeholder"></script>Last 24 hours<script id="metamorph-142-end" type="text/x-placeholder"></script></a></li>
<script id="metamorph-132-end" type="text/x-placeholder"></script><script id="metamorph-133-start" type="text/x-placeholder"></script>
<li><a href="#" data-ember-action="174"><script id="metamorph-143-start" type="text/x-placeholder"></script>Last 1 week<script id="metamorph-143-end" type="text/x-placeholder"></script></a></li>
<script id="metamorph-133-end" type="text/x-placeholder"></script><script id="metamorph-134-start" type="text/x-placeholder"></script>
<li><a href="#" data-ember-action="175"><script id="metamorph-144-start" type="text/x-placeholder"></script>Last 1 month<script id="metamorph-144-end" type="text/x-placeholder"></script></a></li>
<script id="metamorph-134-end" type="text/x-placeholder"></script><script id="metamorph-135-start" type="text/x-placeholder"></script>
<li><a href="#" data-ember-action="176"><script id="metamorph-145-start" type="text/x-placeholder"></script>Last 1 year<script id="metamorph-145-end" type="text/x-placeholder"></script></a></li>
<script id="metamorph-135-end" type="text/x-placeholder"></script><script id="metamorph-136-start" type="text/x-placeholder"></script>
<li><a href="#" data-ember-action="177"><script id="metamorph-146-start" type="text/x-placeholder"></script>Custom<script id="metamorph-146-end" type="text/x-placeholder"></script></a></li>
<script id="metamorph-136-end" type="text/x-placeholder"></script><script id="metamorph-137-end" type="text/x-placeholder"></script>
</ul>
</div>
我尝试了如何在Selenium for Python中切换到新窗口？。但面临问题。
有人可以帮助我如何在新窗口上工作吗？
根据您的问题描述，很难判断是否需要为此使用窗口句柄。你确实提到你试图使用driver.window_handles，但你提到的只是你面临一个问题。由于我不知道这个问题是什么，所以我在这里做一些假设。这两行代码：
driver.find_element_by_id("submit").click()
firefox_elem = driver.find_element_by_tag_name('html') --> login to main page is working fine
******<missing piece: How to select a value from dropdown in next page>******
并不一定意味着firefox_elem = driver.find_element_by_tag_name('html')正在按预期工作。你只是在搜索顶级html标记，但如果驱动程序专注于上一个窗口句柄，则此调用不会引发任何错误。这里并没有真正检查任何东西。
我会使用window_handles和switch_to_window来尝试切换到打开的新窗口：
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
# switch to newly opened window -- the index varies based on number of pages opened.
driver.switch_to_window(driver.window_handles[1])
# click button to expand dropdown (wait on it to exist first)
dropdown_button = WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.XPATH, "//button[@data-toggle='dropdown']")))
dropdown_button.click()
# click the option with text "Last 1 year" (wait on it to exist first)
dropdown_option = WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.XPATH, "//ul/li/a[text()='Last 1 year']")))
dropdown_option.click()
这将单击带有文本"过去 1 年"的下拉项。
我还建议尝试以下方法：
driver.find_element_by_id("submit").click()
firefox_elem = driver.find_element_by_tag_name('html') --> login to main page is working
# switch to newly opened window -- the index varies based on number of pages opened.
driver.switch_to_window(driver.window_handles[1])
print(driver.page_source)
以查看驱动程序认为您的页面源是什么。这将帮助我们确定驱动程序当前关注的内容，以便我们可以确定是否需要利用driver.window_handles和driver.switch_to_window.