美化组：我想要的文本</span>

Question

我正试图提取用^{id1}括起来的跨度所包含的字符串$

<div class="itemText">
    <div class="wrapper">
        <span class="itemPromo">Customer Choice Award Winner</span>
        <a href="http://www.newegg.com/Product/Product.aspx?Item=N82E16819116501" title="View Details" >
            <span class="itemDescription" id="titleDescriptionID" style="display:inline">Intel Core i7-3770K Ivy Bridge 3.5GHz &#40;3.9GHz Turbo&#41; LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 4000 BX80637I73770K</span>
            <span class="itemDescription" id="lineDescriptionID" style="display:none">Intel Core i7-3770K Ivy Bridge 3.5GHz &#40;3.9GHz Turbo&#41; LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 4000 BX80637I73770K</span>
        </a>
    </div>

代码段

f = open('egg.data', 'rb')
content = f.read()
content = content.decode('utf-8', 'replace')
content = ''.join([x for x in content if ord(x) < 128])

soup = bs(content)

for itemText in soup.find_all('div', attrs={'class':'itemText'}):
    wrapper = itemText.div
    wrapper_href = wrapper.a
    for child in wrapper_href.descendants:
        if child['id'] == 'titleDescriptionID':
           print(child, "\n")

回溯错误：

Traceback (most recent call last):
  File "egg.py", line 66, in <module>
    if child['id'] == 'titleDescriptionID':
TypeError: string indices must be integers

Answer 1

wrapper_href.descendants包含任何^{} objects，这就是您要绊倒的地方。NavigableString本质上是字符串对象，您试图用child['id']行来索引它：

>>> next(wrapper_href.descendants)
u'\n'

为什么不直接使用itemText.find('span', id='titleDescriptionID')加载标记呢？

演示：

>>> for itemText in soup.find_all('div', attrs={'class':'itemText'}):
...     print itemText.find('span', id='titleDescriptionID')
...     print itemText.find('span', id='titleDescriptionID').text
... 
<span class="itemDescription" id="titleDescriptionID" style="display:inline">Intel Core i7-3770K Ivy Bridge 3.5GHz (3.9GHz Turbo) LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 4000 BX80637I73770K</span>
Intel Core i7-3770K Ivy Bridge 3.5GHz (3.9GHz Turbo) LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 4000 BX80637I73770K