如何使用Python+Selenium在Blogspot的iframe中评论？

尝试在Blogspot博客发表评论时，代码在定位评论输入框环节触发TimeoutException，无法继续执行。

原代码 #

driver.get(url)
iframe = WebDriverWait(driver, 20).until(EC.presence_of_element_located((By.NAME, 'comment-editor')))
driver.switch_to.frame(iframe)

element=WebDriverWait(driver, 20).until(EC.presence_of_element_located((By.NAME, 'commentBody')))

actionChains = ActionChains(driver)
actionChains.move_to_element(element).click().perform()
actionChains.move_to_element(element).send_keys(text).perform()

错误栈信息 #

Traceback (most recent call last):
  File "C:/Users/Hotto/PycharmProjects/blogspot/chromes.py", line 51, in <module>
    element=WebDriverWait(driver, 20).until(EC.presence_of_element_located((By.NAME, 'commentBody')))
  File "C:\Users\Hotto\AppData\Local\Programs\Python\Python38\lib\site-packages\selenium\webdriver\support\wait.py", line 89, in until
    raise TimeoutException(message, screen, stacktrace)
selenium.common.exceptions.TimeoutException: Message: 
Stacktrace:
Backtrace:
    Ordinal0 [0x00405FD3+2187219]
    Ordinal0 [0x0039E6D1+1763025]
    Ordinal0 [0x002B3E78+802424]
    Ordinal0 [0x002E1C10+990224]
    Ordinal0 [0x002E1EAB+990891]
    Ordinal0 [0x0030EC92+1174674]
    Ordinal0 [0x002FCBD4+1100756]
    Ordinal0 [0x0030CFC2+1167298]
    Ordinal0 [0x002FC9A6+1100198]
    Ordinal0 [0x002D6F80+946048]
    Ordinal0 [0x002D7E76+949878]
    GetHandleVerifier [0x006A90C2+2721218]
    GetHandleVerifier [0x0069AAF0+2662384]
    GetHandleVerifier [0x0049137A+526458]
    GetHandleVerifier [0x00490416+522518]
    Ordinal0 [0x003A4EAB+1789611]
    Ordinal0 [0x003A97A8+1808296]
    Ordinal0 [0x003A9895+1808533]
    Ordinal0 [0x003B26C1+1844929]
    BaseThreadInitThunk [0x7697343D+18]
    RtlInitializeExceptionChain [0x77729812+99]
    RtlInitializeExceptionChain [0x777297E5+54]

测试URL：https://lf2011b8308.blogspot.com/2011/12/macronutrients-carbohydrates-proteins.html

解决方案 #

问题根源在于元素定位方式错误，且未触发评论区资源加载，修正后的代码如下：

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

url = "https://lf2011b8308.blogspot.com/2011/12/macronutrients-carbohydrates-proteins.html"
comment_text = "测试评论内容"

driver = webdriver.Chrome()
driver.get(url)

# 滚动到评论区，触发编辑器iframe加载
comment_section = WebDriverWait(driver, 20).until(
    EC.presence_of_element_located((By.ID, "comments"))
)
driver.execute_script("arguments[0].scrollIntoView();", comment_section)

# 正确定位评论编辑器iframe（实际属性为id="comment-editor"，而非name）
editor_iframe = WebDriverWait(driver, 20).until(
    EC.presence_of_element_located((By.ID, "comment-editor"))
)
driver.switch_to.frame(editor_iframe)

# 定位评论输入框（实际元素使用class属性，而非name="commentBody"）
comment_box = WebDriverWait(driver, 20).until(
    EC.element_to_be_clickable((By.CLASS_NAME, "text_editor"))
)

# 输入评论内容
comment_box.click()
comment_box.send_keys(comment_text)

# 如需提交评论，切换回主页面后定位提交按钮
# driver.switch_to.default_content()
# submit_btn = WebDriverWait(driver, 20).until(
#     EC.element_to_be_clickable((By.ID, "comment-post-button"))
# )
# submit_btn.click()

# driver.quit()

关键修正点 #

1. 先滚动到评论区#comments，确保编辑器iframe被浏览器加载；
2. 原代码错误使用name定位iframe，实际该iframe的唯一标识是id="comment-editor"；
3. 评论输入框不存在name="commentBody"属性，改用class="text_editor"定位，且使用element_to_be_clickable确保元素可交互，比presence_of_element_located更可靠。

内容的提问来源于stack exchange，提问作者Akif