Question

有时在页面上我正在抓，“价格”xpath无法找到。当它找不到“价格”xpath元素而不是以错误结尾时，我想用“没有定价信息”的文字替换。我确定它与“尝试和除外”有关，但不知道如何编写它。谢谢！

在最后一个代码块中更新

#finds titles
deal_title = browser.find_elements_by_xpath("//a[@id='dealTitle']/span")
titles = []
for title in deal_title:
    titles.append(title.text)

#finds links
deal_link = browser.find_elements_by_xpath("//div[@class='a-row dealDetailContainer']/div/a[@id='dealTitle']")
links = []
for link in deal_link:
    links.append(link.get_attribute('href'))

#finds images
deal_image = browser.find_elements_by_xpath("//a[@id='dealImage']/div/div/div/img")
images = []
for image in deal_image:
    images.append(image.get_attribute('src'))

#finds prices (if present)    
deal_price = browser.find_elements_by_xpath("//div[@class='a-row priceBlock unitLineHeight']/span")
prices = []
for price in deal_price:
    prices.append(price.text)

#writes to html
for title, link, image, price in zip(titles, links, images, prices):
    f.write("<tr class='border'><td class='image'>" + "<img src=" + image + "></td>" + "<td class='title'><a href=" + link + '>'">" + title + "</a></td><td class='price'>" + price + "</td></tr>")

更新：所以我已经将代码更新为这样，因此价格的价值将有一个占位符而不是通过它，这会在写入文件时导致（标题，链接，图像，价格）不匹配。有关如何正确执行此操作的任何想法，所以当它写入时，文本“打印/写入此文本是否已存在”将被写入文件？

#finds titles
deal_title = browser.find_elements_by_xpath("//a[@id='dealTitle']/span")
titles = []
for title in deal_title:
    titles.append(title.text)

#finds links
deal_link = browser.find_elements_by_xpath("//div[@class='a-row dealDetailContainer']/div/a[@id='dealTitle']")
links = []
for link in deal_link:
    links.append(link.get_attribute('href'))

#finds images
deal_image = browser.find_elements_by_xpath("//a[@id='dealImage']/div/div/div/img")
images = []
for image in deal_image:
    images.append(image.get_attribute('src'))

try:

    deal_price = browser.find_elements_by_xpath("//div[@class='a-row priceBlock unitLineHeight']/span")
    prices = []
    for price in deal_price:
        prices.append(price.text)

except NoSuchElementException:
    price = ("PRINT/WRITE THIS TEXT INSTEAD OF PASSING")

#writes to html
for title, link, image, price in zip(titles, links, images, prices):
    f.write("<tr class='border'><td class='image'>" + "<img src=" + image + "></td>" + "<td class='title'><a href=" + link + '>'">" + title + "</a></td><td class='price'>" + price + "</td></tr>")

Answer 1

在尝试迭代之前检查deal_price的值。

deal_price = browser.find_elements_by_xpath("//div[@class='a-row priceBlock unitLineHeight']/span")

# did we find any prices?
if deal_price:
    prices = []
    for price in deal_price:
        prices.append(price.text)

else:
    # handle missing prices...

Answer 2

如果无法找到价格替换文字价格不可用，您可以使用以下解决方案：

代码块：

from selenium import webdriver
from selenium.common.exceptions import NoSuchElementException

options = webdriver.ChromeOptions() 
options.add_argument("start-maximized")
options.add_argument('disable-infobars')
browser=webdriver.Chrome(chrome_options=options, executable_path=r'C:\Utility\BrowserDrivers\chromedriver.exe')
browser.get("https://www.amazon.com/gp/goldbox/ref=gbps_ftr_s-4_bedf_page_10?gb_f_deals1=enforcedCategories:2972638011,dealStates:AVAILABLE%252CWAITLIST%252CWAITLISTFULL,includedAccessTypes:,page:10,sortOrder:BY_SCORE,dealsPerPage:32&pf_rd_p=afc45143-5c9c-4b30-8d5c-d838e760bedf&pf_rd_s=slot-4&pf_rd_t=701&pf_rd_i=gb_main&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=ZDV4YBQJFDVR3PAY4ZBS&ie=UTF8")
#finds images
deal_image = browser.find_elements_by_xpath("//div[@class='a-row dealContainer dealTile']//div[@class='a-row layer']/img")
images = []
prices = []
for image in deal_image:
    images.append(image.get_attribute('src'))
    #finds relevant prices
    try :
        deal_price = image.find_element_by_xpath("./following::div[2]//div[@class='a-row a-spacing-mini'][2]/div[@class='a-row priceBlock unitLineHeight']/span")
        prices.append(deal_price.get_attribute("innerHTML"))
    except NoSuchElementException:
        prices.append("Price Unavailable") 

#print the information
for image, price in zip(images, prices):
    print(image, price)

控制台输出：

https://images-na.ssl-images-amazon.com/images/I/5102g01O1nL._AA210_.jpg $19.60
https://images-na.ssl-images-amazon.com/images/I/51N2rdMSh0L._AA210_.jpg $22.99 - $24.99
https://images-na.ssl-images-amazon.com/images/I/31XsztnbNGL._AA210_.jpg $123.20 - $133.63
https://images-na.ssl-images-amazon.com/images/I/31fNbfTW35L._AA210_.jpg $241.21 - $267.00
https://images-na.ssl-images-amazon.com/images/I/41fuZZwdruL._AA210_.jpg $41.24
https://images-na.ssl-images-amazon.com/images/I/51hC7rJT-VL._AA210_.jpg $39.95
https://images-na.ssl-images-amazon.com/images/I/41nziezVczL._AA210_.jpg Price Unavailable
https://images-na.ssl-images-amazon.com/images/I/41OeZ0KTE8L._AA210_.jpg Price Unavailable
https://images-na.ssl-images-amazon.com/images/I/41QVEcJWLeL._AA210_.jpg Price Unavailable
https://images-na.ssl-images-amazon.com/images/I/51XqV4DKV%2BL._AA210_.jpg $92.24
https://images-na.ssl-images-amazon.com/images/I/31-QDRkNbhL._AA210_.jpg $15.80
https://images-na.ssl-images-amazon.com/images/I/51MQu5v%2BQJL._AA210_.jpg $17.41
https://images-na.ssl-images-amazon.com/images/I/316KunRLRZL._AA210_.jpg Price Unavailable
https://images-na.ssl-images-amazon.com/images/I/512s5ZrjoFL._AA210_.jpg $51.99
https://images-na.ssl-images-amazon.com/images/I/51A8Nfvf8eL._AA210_.jpg $8.30
https://images-na.ssl-images-amazon.com/images/I/51aDac6YN5L._AA210_.jpg $18.53
https://images-na.ssl-images-amazon.com/images/I/418aN7ErLJL._AA210_.jpg $179.30
https://images-na.ssl-images-amazon.com/images/I/31SQON%2BiOBL._AA210_.jpg $9.75
https://images-na.ssl-images-amazon.com/images/I/519hxsMZlTL._AA210_.jpg $38.99
https://images-na.ssl-images-amazon.com/images/I/515keAWwYYL._AA210_.jpg $7.97
https://images-na.ssl-images-amazon.com/images/I/31aNppsuZEL._AA210_.jpg $9.49
https://images-na.ssl-images-amazon.com/images/I/4104Jm-d3IL._AA210_.jpg $15.35
https://images-na.ssl-images-amazon.com/images/I/31abuAZRuqL._AA210_.jpg Price Unavailable
https://images-na.ssl-images-amazon.com/images/I/51en-FhtpbL._AA210_.jpg Price Unavailable
https://images-na.ssl-images-amazon.com/images/I/41qLIdqYXjL._AA210_.jpg Price Unavailable
https://images-na.ssl-images-amazon.com/images/I/41bbblEeCWL._AA210_.jpg Price Unavailable
https://images-na.ssl-images-amazon.com/images/I/316fGtNzmZL._AA210_.jpg $12.71
https://images-na.ssl-images-amazon.com/images/I/51OtBDMnPtL._AA210_.jpg $55.86
https://images-na.ssl-images-amazon.com/images/I/51IwkmtXKhL._AA210_.jpg $22.53
https://images-na.ssl-images-amazon.com/images/I/41fsdPNN71L._AA210_.jpg $23.31
https://images-na.ssl-images-amazon.com/images/I/41vgtpZ5H3L._AA210_.jpg $21.01
https://images-na.ssl-images-amazon.com/images/I/41vXJ9fvcIL._AA210_.jpg $88.99
https://images-na.ssl-images-amazon.com/images/I/41qzYct%2BPNL._AA210_.jpg Price Unavailable
https://images-na.ssl-images-amazon.com/images/I/51K4hWy5wBL._AA210_.jpg Price Unavailable
https://images-na.ssl-images-amazon.com/images/I/51oxPj3Fz8L._AA210_.jpg Price Unavailable
https://images-na.ssl-images-amazon.com/images/I/51rCyK90S2L._AA210_.jpg Price Unavailable

链接：

https://www.amazon.com/gp/goldbox/ref=gbps_ftr_s-4_bedf_page_10?gb_f_deals1=enforcedCategories:2972638011,dealStates:AVAILABLE%252CWAITLIST%252CWAITLISTFULL,includedAccessTypes:,page:10,sortOrder:BY_SCORE,dealsPerPage:32&pf_rd_p=afc45143-5c9c-4b30-8d5c-d838e760bedf&pf_rd_s=slot-4&pf_rd_t=701&pf_rd_i=gb_main&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=ZDV4YBQJFDVR3PAY4ZBS&ie=UTF8

浏览器快照：

元素无法找到，替代文本

2 个答案: