TypeError：'NoneType'对象不可迭代（硒2.49）

Question

所以，我试图做一个“用户友好”的自动刮板。我基本上想要它做的是，刮一页，点击按钮，刮那个页面，点击按钮。并根据用户的需要有多次循环。 （是的，我知道缩进的时候，我是测试一些东西

from selenium import webdriver 
import time 

# Credit 


# Vars 
website_name = input("Webstie: ") 
class_name = input("Class name: ") 
button_xpath = input("what's the XPATH that you want to click (normally a button): ") 
number_of_pages = int(input("How many pages would you like to scrape: ")) 

path = r"C:\Users\Skid\Desktop\chromedriver.exe" 
driver = webdriver.Chrome(path) 
driver.get(website_name + "") 


def NormalScrape(): 
    for x in range(number_of_pages): 
     time.sleep(5) 
    print("1") 
    posts = driver.find_elements_by_class_name(class_name) 
    time.sleep(2) 
    print("2") 
    driver.find_element_by_xpath('.' + button_xpath).click() 
    for post in posts: 
     print(post.text) 

NormalScrape() 

错误：

Traceback (most recent call last): 
    File "C:/Users/Skid/PycharmProjects/untitled/PureTest.py", line 34, in <module> 
    NormalScrape() 
    File "C:/Users/Skid/PycharmProjects/untitled/PureTest.py", line 31, in NormalScrape 
    print(post.text) 
    File "C:\Users\Skid\AppData\Local\Programs\Python\Python35-32\lib\site-packages\selenium\webdriver\remote\webelement.py", line 71, in text 
    return self._execute(Command.GET_ELEMENT_TEXT)['value'] 
    File "C:\Users\Skid\AppData\Local\Programs\Python\Python35-32\lib\site-packages\selenium\webdriver\remote\webelement.py", line 454, in _execute 
    return self._parent.execute(command, params) 
    File "C:\Users\Skid\AppData\Local\Programs\Python\Python35-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 201, in execute 
    self.error_handler.check_response(response) 
    File "C:\Users\Skid\AppData\Local\Programs\Python\Python35-32\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 181, in check_response 
    raise exception_class(message, screen, stacktrace) 
selenium.common.exceptions.StaleElementReferenceException: Message: stale element reference: element is not attached to the page document 
    (Session info: chrome=47.0.2526.111) 
    (Driver info: chromedriver=2.20.353145 (343b531d31eeb933ec778dbcf7081628a1396067),platform=Windows NT 10.0 x86_64) 

Exception ignored in: <bound method Service.__del__ of <selenium.webdriver.chrome.service.Service object at 0x00F4DB10>> 
Traceback (most recent call last): 
    File "C:\Users\Skid\AppData\Local\Programs\Python\Python35-32\lib\site-packages\selenium\webdriver\common\service.py", line 136, in __del__ 
    File "C:\Users\Skid\AppData\Local\Programs\Python\Python35-32\lib\site-packages\selenium\webdriver\common\service.py", line 120, in stop 
    File "C:\Users\Skid\AppData\Local\Programs\Python\Python35-32\lib\site-packages\selenium\webdriver\common\service.py", line 95, in send_remote_shutdown_command 
    File "<frozen importlib._bootstrap>", line 969, in _find_and_load 
    File "<frozen importlib._bootstrap>", line 954, in _find_and_load_unlocked 
    File "<frozen importlib._bootstrap>", line 887, in _find_spec 
TypeError: 'NoneType' object is not iterable 

Answer 1

这是一个现有的bug 硒2.49 +的Python 3 +镀铬：

• Problem with Python 3 + 2.49

作为一个解决方法，降级到2.48：

pip3 install selenium==2.48