我需要获取 html 文档的平均 div 高度和宽度。
我已经尝试过这个解决方案，但它不起作用：
import numpy as np
average_width = np.mean([div.attrs['width'] for div in my_doc.get_div() if 'width' in div.attrs])
average_height = np.mean([div.attrs['height'] for div in my_doc.get_div() if 'height' in div.attrs])
print average_height,average_width
the get_div方法返回由 检索到的所有 div 的列表find_all美丽汤的做法
这是一个例子：
print my_doc.get_div()[1]
<div style="position:absolute; border: textbox 1px solid; writing-mode:lr-tb; left:45px; top:81px; width:127px; height:9px;">
<span style="font-family: EICMDA+AdvTrebu-R; font-size:8px">Journal of Infection (2015)
</span>
<span style="font-family: EICMDB+AdvTrebu-B; font-size:8px">xx</span>
<span style="font-family: EICMDA+AdvTrebu-R; font-size:8px">, 1</span>
<span style="font-family: EICMDD+AdvPS44A44B; font-size:7px">e</span>
<span style="font-family: EICMDA+AdvTrebu-R; font-size:8px">4
<br/>
</span>
</div>
当我获得属性时，它工作得很好
print my_doc.get_div()[1].attrs
{u'style': u'position:absolute; border: textbox 1px solid; writing-mode:lr-tb; left:45px; top:81px; width:127px; height:9px;'}
但当我尝试获取价值时
print my_doc.get_div()[1].attrs['width']
我收到错误：
KeyError: 'width'
但我不明白，因为当我检查类型时：
print type(my_doc.get_div()[1].attrs)
这是一本字典，<type 'dict'>
也许还有更好的办法——
Way -1
下面是我测试过的提取代码width and height.
from bs4 import BeautifulSoup
html_doc = '''<div style="position:absolute; border: textbox 1px solid; writing-mode:lr-tb; left:45px; top:81px; width:127px; height:9px;">
<span style="font-family: EICMDA+AdvTrebu-R; font-size:8px">Journal of Infection (2015)
</span>
<span style="font-family: EICMDB+AdvTrebu-B; font-size:8px">xx</span>
<span style="font-family: EICMDA+AdvTrebu-R; font-size:8px">, 1</span>
<span style="font-family: EICMDD+AdvPS44A44B; font-size:7px">e</span>
<span style="font-family: EICMDA+AdvTrebu-R; font-size:8px">4
<br/>
</span>
</div>'''
soup = BeautifulSoup(html_doc,'html.parser')
my_att = [i.attrs['style'] for i in soup.find_all("div")]
dd = ''.join(my_att).split(";")
dd_cln= filter(None, dd)
dd_cln= [i.strip() for i in dd_cln ]
my_dict = dict(i.split(':') for i in dd_cln)
print my_dict['width']
Way-2按照描述使用正则表达式here.
工作代码-
import numpy as np
import re
from bs4 import BeautifulSoup
html_doc = '''<div style="position:absolute; border: textbox 1px solid; writing-mode:lr-tb; left:45px; top:81px; width:127px; height:9px;">
<span style="font-family: EICMDA+AdvTrebu-R; font-size:8px">Journal of Infection (2015)
</span>
<span style="font-family: EICMDB+AdvTrebu-B; font-size:8px">xx</span>
<span style="font-family: EICMDA+AdvTrebu-R; font-size:8px">, 1</span>
<span style="font-family: EICMDD+AdvPS44A44B; font-size:7px">e</span>
<span style="font-family: EICMDA+AdvTrebu-R; font-size:8px">4
<br/>
</span>
</div>'''
soup = BeautifulSoup(html_doc,'html.parser')
my_att = [i.attrs['style'] for i in soup.find_all("div")]
css = ''.join(my_att)
print css
width_list = map(float,re.findall(r'(?<=width:)(\d+)(?=px;)', css))
height_list = map(float,re.findall(r'(?<=height:)(\d+)(?=px;)', css))
print np.mean(height_list)
print np.mean(width_list)
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