python-3.x - 如果消息元素不可见，则跳过python Selenium 跳过页面

Question

我正在尝试从页面中获取文本元素。要访问此元素，我的脚本会在页面上单击两个过滤器。我需要抓取5,000页。该脚本在收集文本元素方面起作用，但是，在一定数量的页面之后，它总是返回一条消息“元素不可见”。我认为这是由于页面未及时加载而造成的，因为我检查了页面中断且文本元素在其中的情况。 (每次单击后我已经实现了time.sleep(3))。如果页面未及时加载，我可以在脚本中使用什么来跳过该页面？

def yelp_scraper(url):
    driver.get(url)
    # get total number of restaurants 
    total_rest_loc = '//span[contains(text(),"Showing 1")]'
    total_rest_raw = driver.find_element_by_xpath(total_rest_loc).text
    total_rest = int(re.sub(r'Showing 1.*of\s','',total_rest_raw))

    button1 = driver.find_element_by_xpath('//span[@class="filter-label filters-toggle js-all-filters-toggle show-tooltip"]')
    button1.click()
    time.sleep(1)

    button2 = driver.find_element_by_xpath('//span[contains(text(),"Walking (1 mi.)")]')
    button2.click()
    time.sleep(2)

    rest_num_loc = '//span[contains(text(),"Showing 1")]'
    rest_num_raw = driver.find_element_by_xpath(rest_num_loc).text
    rest_num = int(re.sub(r'Showing 1.*of\s','',rest_num_raw))

    if total_rest==rest_num:

        button3 = driver.find_element_by_xpath('//span[contains(text(),"Biking (2 mi.)")]')
        button3.click()
        time.sleep(2)

        button4 = driver.find_element_by_xpath('//span[contains(text(),"Walking (1 mi.)")]')
        button4.click()
        time.sleep(2)

        rest_num_loc = '//span[contains(text(),"Showing 1")]'
        rest_num_raw = driver.find_element_by_xpath(rest_num_loc).text
        rest_num = int(re.sub(r'Showing 1.*of\s','',rest_num_raw))


    return(rest_num)


chromedriver = "/Applications/chromedriver" # path to the chromedriver executable
os.environ["webdriver.chrome.driver"] = chromedriver


chrome_options = Options()
# add headless mode
chrome_options.add_argument("--headless")
# turn off image loading
prefs = {"profile.managed_default_content_settings.images":2}
chrome_options.add_experimental_option("prefs",prefs)

driver = webdriver.Chrome(chromedriver, chrome_options=chrome_options)


for url in url_list:
    yelp_data[url] = yelp_scraper(url)

json.dump(yelp_data, open('../data/yelp_json/yelp_data.json', 'w'), indent="\t")


driver.close()

Answer 1

示例:

    from selenium.common.exceptions import NoSuchElementException
    for item in driver.find_elements_by_class_name('item'):
        try:
        model = item.find_element_by_class_name('product-model')
        price = item.find_element_by_class_name('product-display-price')
        title = item.find_element_by_class_name('product-title')
        url = item.find_element_by_class_name('js-detail-link')

        items.append({'model': model, 'price': price, 'title': title, 'url': url})
        print (model.text, price.text, title.text, url.get_attribute("href"))
        c = (model.text, price.text, title.text, url.get_attribute("href"))
        a.writerow(c)
    except NoSuchElementException:
#here you can do what you want to do when an element is not found. Then it'll continue with the next one. 
b.close()