Question

为什么这段代码不能工作并给出AttributeError？

internship = parser.find_all('a', attrs = {'title': lambda job: job.startswith('Internship')})

虽然这个有效：

internship = parser.find_all('a', attrs = {'title': lambda job: job and job.startswith('Internship')})

这是我从第一个代码中得到的错误：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python27\lib\site-packages\bs4\element.py", line 1299, in find_all
   return self._find_all(name, attrs, text, limit, generator, **kwargs)
  File "C:\Python27\lib\site-packages\bs4\element.py", line 549, in _find_all
   found = strainer.search(i)
  File "C:\Python27\lib\site-packages\bs4\element.py", line 1690, in search
   found = self.search_tag(markup)
  File "C:\Python27\lib\site-packages\bs4\element.py", line 1662, in search_tag
    if not self._matches(attr_value, match_against):
  File "C:\Python27\lib\site-packages\bs4\element.py", line 1722, in _matches
    return match_against(markup)
  File "<stdin>", line 1, in <lambda>
AttributeError: 'NoneType' object has no attribute 'startswith'

蟒蛇。 AttributeError：＆＃39; NoneType＆＃39;对象没有属性＆＃39; startswith＆＃39;

0 个答案: