使用BeautifulSoup时Python None检查似乎失败
我看过一些类似的帖子，虽然它们和我的情况很接近，但我的结果还是让我感到意外。
import BeautifulSoup
import re
soup = BeautifulSoup.BeautifulSoup(<html page of interest>)
if (soup.find_all("td", attrs= {"class": "FilterElement"}, text= re.compile("HERE IS TEXT I AM LOOKING FOR")) is None):
print('There was no entry')
else:
print(soup.find("td", attrs= {"class": "FilterElement"}, text= re.compile("HERE IS THE TEXT I AM LOOKING FOR")))
我显然过滤掉了实际的HTML页面，以及正则表达式中的文本。其余部分完全按照我写的内容。然后我遇到了以下错误：
Traceback (most recent call last):
File "/Users/appa/src/workspace/web_forms/WebForms/src/root/queryForms.py", line 51, in <module>
LoopThroughDays(form, id, trailer)
File "/Users/appa/src/workspace/web_forms/WebForms/src/root/queryForms.py", line 33, in LoopThroughDays
if (soup.find_all("td", attrs= {"class": "FilterElement"}, text= re.compile("HERE IS THE TEXT I AM LOOKING FOR")) is None):
TypeError: 'NoneType' object is not callable
我明白有时候文本可能会缺失。但我以为我设置的这个if语句正好可以捕捉到缺失的情况，因此会返回一个NoneType。
提前感谢任何帮助！
1 个回答
2
看起来这只是个打字错误。应该是 soup.findAll 而不是 soup.find_all。我试着运行了一下，改正后就能正常工作了。所以完整的程序应该是：
import BeautifulSoup
import re
soup = BeautifulSoup.BeautifulSoup(<html page of interest>)
if (soup.findAll("td", attrs= {"class": "FilterElement"}, text= re.compile("HERE IS TEXT I AM LOOKING FOR")) is None):
print('There was no entry')
else:
print(soup.find("td", attrs= {"class": "FilterElement"}, text= re.compile("HERE IS THE TEXT I AM LOOKING FOR")))<html page of interest>