Python selenium 无法通过 id 找到元素

Question

开始学习python selenium，遇到一个小问题

>>> from selenium import webdriver
>>> dr = webdriver.Chrome('C:/Users/Dima/Desktop/chromedriver.exe')
>>> dr.get('https://www.instagram.com/accounts/login/?source=auth_switcher')
>>> pole = dr.find_element_by_id('f213cb817d764e4')
Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    pole = dr.find_element_by_id('f213cb817d764e4')
  File "C:\Users\Dima\AppData\Local\Programs\Python\Python37-32\lib\site- 
packages\selenium\webdriver\remote\webdriver.py", line 360, in 
find_element_by_id
return self.find_element(by=By.ID, value=id_)
File "C:\Users\Dima\AppData\Local\Programs\Python\Python37-32\lib\site- 
packages\selenium\webdriver\remote\webdriver.py", line 978, in find_element
    'value': value})['value']
  File "C:\Users\Dima\AppData\Local\Programs\Python\Python37-32\lib\site- 
packages\selenium\webdriver\remote\webdriver.py", line 321, in execute
self.error_handler.check_response(response)
  File "C:\Users\Dima\AppData\Local\Programs\Python\Python37-32\lib\site- 
packages\selenium\webdriver\remote\errorhandler.py", line 242, in 
  check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.NoSuchElementException: Message: no such element: 
Unable to locate element: {"method":"id","selector":"f213cb817d764e4"}
  (Session info: chrome=71.0.3578.98)
  (Driver info: chromedriver=2.45.615291 
(ec3682e3c9061c10f26ea9e5cdcf3c53f3f74387),platform=Windows NT 10.0.17763 
x86_64)

我可以做什么？ 我从文档中做所有事情，但它不起作用。

Answer 1

@id是动态生成的，因此每次运行脚本时都会有所不同。 如果要选择用户名输入字段，请尝试按@name选择：

dr.find_element_by_name('username')

Answer 2

Instagram 上的用户send_keys()段是React Native元素，因此您必须诱导WebDriverWait然后调用send_keys()方法，如下所示：

WebDriverWait(browser, 20).until(EC.element_to_be_clickable((By.CSS_SELECTOR, "input[name='username']"))).send_keys("ITishnik_ArtStudio")

注意：您必须添加以下导入：

from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC