关于这个该死的报错：TypeError - 'undefined' is not a function (evaluating '_getTagName(currWindow).toLowerCase()')

在利用Selenium爬取页面信息的时候突然报错，第一条信息爬取的时候还好好的，第二条就不行了。

请参考网上的爬取代码：

 # coding=utf-8
 """
 Created on 2015-12-10 @author: Eastmount
 利用Selenium爬取百度百科5A级景区的内容介绍的代码
 """

 import time
 import re
 import os
 import sys
 import codecs
 import shutil
 from selenium import webdriver
 from selenium.webdriver.common.keys import Keys
 import selenium.webdriver.support.ui as ui
 from selenium.webdriver.common.action_chains import ActionChains

 # Open PhantomJS
 # driver = webdriver.PhantomJS(executable_path="D:\phantomjs-2.1.1-windows\sbin\phantomjs.exe")
 driver = webdriver.PhantomJS(executable_path="D:\phantomjs-1.9.8-windows\phantomjs.exe")
 # driver = webdriver.Firefox()
 wait = ui.WebDriverWait(driver, 10)  # 显示等待时间(实例，最大等待时间)

 # Get the Content of 5A tourist spots
 def getInfobox(entityName, fileName):
     try:
         # create paths and txt files
         print(u'文件名称: ', fileName)
         info = codecs.open(fileName, 'w', 'utf-8')

         # locate input  notice: 1.visit url by unicode 2.write files
         # Error: Message: Element not found in the cache
         #       Perhaps the page has changed since it was looked up
         # 解决方法: 使用Selenium和Phantomjs

         print(u'实体名称: ', entityName.rstrip('\n'))
         driver.get("http://baike.baidu.com/")
         elem_inp = driver.find_element_by_xpath("//form[@id='searchForm']/input")
         # elem_inp = driver.find_elements_by_xpath("//div[@class='lemma-summary']/div")
         elem_inp.send_keys(entityName)
         elem_inp.send_keys(Keys.RETURN)
         info.write(entityName.rstrip('\n') + '\r\n')  # codecs不支持'\n'换行

         # load content 摘要
         elem_value = driver.find_elements_by_xpath("//div[@class='lemma-summary']/div")
         for value in elem_value:
             print(value.text)
             info.writelines(value.text + '\r\n')

         # 爬取文本信息
         # 爬取所有段落<div class='para'>的内容 class='para-title'为标题 [省略]

         time.sleep(2)
     # except Exception as e:  # 'utf8' codec can't decode byte
     #     print("Error: ", e)
     finally:
         print('\n')
         info.close()

 # Main function
 def main():
     # By function get information
     path = "BaiduSpider\\"
     if os.path.isdir(path):
         shutil.rmtree(path, True)
     os.makedirs(path)
     source = open("Tourist_spots_5A.txt", 'r')
     num = 1
     for entityName in source:
         # entityName = unicode(entityName, "utf-8")
         if u'故宫' in entityName:  # else add a '?'
             entityName = '北京故宫'
         # else: Name = entityName.rstrip('\n')
         name = "%04d" % num
         fileName = path + str(name) + ".txt"
         getInfobox(entityName, fileName)
         num = num + 1
     print('End Read Files!')
     source.close()
     driver.close()

 if __name__ == '__main__':
     main()

执行报错信息为：

Traceback (most recent call last):
File "D:/pycharm/untitled_DB/wordcloud/selenium爬取百度百科/Selenium_baidu.py", line 85, in <module>
main()
File "D:/pycharm/untitled_DB/wordcloud/selenium爬取百度百科/Selenium_baidu.py", line 77, in main
getInfobox(entityName, fileName)
File "D:/pycharm/untitled_DB/wordcloud/selenium爬取百度百科/Selenium_baidu.py", line 41, in getInfobox
elem_inp.send_keys(Keys.RETURN)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\selenium\webdriver\remote\webelement.py", line 479, in send_keys

'value': keys_to_typing(value)})
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\selenium\webdriver\remote\webelement.py", line 628, in _execute
return self._parent.execute(command, params)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 312, in execute
self.error_handler.check_response(response)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 208, in check_response
raise exception_class(value)
selenium.common.exceptions.WebDriverException: Message: TypeError - 'undefined' is not a function (evaluating '_getTagName(currWindow).toLowerCase()')

找了1天都没找到原因，真的 死烦 ，找到原因是71行代码写死，然而要是不加判断也会出现这样的报错，比较郁闷，后来查了半天资料，在Stackoverflow的评论中找到思路，很有可能是read文件的时候，读取到的内容格式有问题，于是查看了一下格式发现，果不其然，多了一个"/n"，修改代码：

if u'故宫' in entityName:  # else add a '?'
　　entityName = '北京故宫'
else: 
　　entityName = entityName.rstrip('\n')
name = "%04d" % num
fileName = path + str(name) + ".txt"
getInfobox(entityName, fileName)
num = num + 1

在执行，ok，请忽略渣渣排版