错误有时会发生，有时发生在不同的地方

Question

下面的错误会不时弹出，但并不总是在同一个地方。不太清楚为什么。有线索吗？这里的完整代码：完整代码

文件“/users/davidkasapchuk/pycharmprojects/test/homedepotfridges.py”，第257行，在price=item.find_element_by_class_name('product-display-price')文件“/library/frameworks/python.framework/versions/3.5/lib/python3.5/site-packages/selenium/webdriver/remote/webelement.py”，第264行，在find_element_by_class_name返回driver/remote/webelement.py“，第478行，在find_element{”using“：by,”value“：value}）['value']文件”/library/frameworks/python.framework/versions/3.5/lib/python3.5/site-packages/selenium/webdriver/remote/webelement.py“，第461行，在_execute返回self._parent.execute（命令，params）文件”frameworks/python.framework/versions/3.5/lib/python3.5/site-packages/selenium/webdriver/remote/errorhandler.py“，第192行，在check_response中引发exception_class（message,screen,stacktrace）selenium.common.exceptions.nosuchelementexception：message：{”errormessage“：”无法找到类名为'product-display-price'的元素“，”request“：{”headers“：{”accept“：”application/json“，”-urllib/3.5“}，”httpversion“：”1.1“，”方法“：”post“，”post“：”{\\ID\“:\\:WDC:1473895291967\”，“using\”:\“类名\”，“sessionid\”“：”/element“、”端口“：”“、”主机“：”、“密码”：“、”用户“：”、“用户信息”：“、”授权“：”、“协议”：“、”源“：”/element“、”查询键“：{}、”块“：[”element“]}、”urlorig“Inal“：”/Session/EB417D30-7AD1-11E6-82C2-D52D6CD5B804/Element/:WDC:1473895291967/Element“}}截图：可通过屏幕获得

在处理上述异常的过程中，发生了另一个异常：

Traceback（最近调用为last）：文件“/users/user/pycharmprojects/test/homedepotfridges.py”，第266行，在模型='n/a'中。text attributeerror:'str'object没有属性'text'>

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

b = open('csv/homedepotfridges.csv', 'w', newline='')
a = csv.writer(b,delimiter=',')

driver = webdriver.PhantomJS()
driver.get('https://www.homedepot.ca/en/home/categories/appliances/refrigerators-and-freezers/refrigerators.html')
time.sleep(15)
items = []

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:
    model = 'n/a'.text
    price = 'N/A'.text
    title = 'N/A'.text
    url = 'N/A'.text
    items.append({'model': model, 'price': price, 'title': title, 'url': url})
    print(model.text, price.text, title.text, url.get_attribute.text("href"))
    c = (model.text, price.text, title.text, url.get_attribute("href"))
    a.writerow(c)
b.close()

b = open('csv/homedepotfridges.csv', 'a', newline='')
a = csv.writer(b,delimiter=',')

driver = webdriver.PhantomJS()
driver.get('https://www.homedepot.ca/en/home/categories/appliances/refrigerators-and-freezers/refrigerators.html#!p=1&q=*%3Arelevance%3AcategoryPathHierarchy%3A3%2Fhd-classes%2Fl1-appliances%2Fl2-refrigerators-freezers%2F1010215')
time.sleep(15)
items = []

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:
        model = 'n/a'.text
        price = 'N/A'.text
        title = 'N/A'.text
        url = 'N/A'.text
        items.append({'model': model, 'price': price, 'title': title, 'url': url})
        print(model.text, price.text, title.text, url.get_attribute.text("href"))
        c = (model.text, price.text, title.text, url.get_attribute("href"))
        a.writerow(c)
b.close()

Answer 1

在对元素执行操作之前，您可能应该使用某种等待来等待元素加载。可以解决你的问题。