报错:
'Only the following pseudo-classes are implemented: nth-of-type.')
NotImplementedError: Only the following pseudo-classes are implemented: nth-of-type.
解决办法:
nth-child 改为 nth-of-type
from bs4 import BeautifulSoup as bs
a = '''
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<h1 class="title">内乡宝天曼峡谷漂流景区开漂公告</h1>
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<a href="/">内乡政府门户网站  www.neixiangxian.gov.cn</a>
  <span>2018-04-19 17:32:17</span>  
<span>来源:内乡县政府网站</span>
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'''
soup = bs(a,'lxml')
b = soup.select('span:nth-of-type(2)')
print(b)