我想使用lxml和cssselect从选择下拉框中获取/抓取数据。
到目前为止，我已经尝试了一些东西并在网上搜索没有运气：
所以我正在抓取的页面上有以下或类似的代码：
<select id="attribute501" class="required-entry super-attribute-select" name="super_attribute[501]">
<option value="">Choose an Option...</option>
<option value="33">5</option>
<option value="31">10</option>
</select>
使用以下cssselect语句：
css_sel_price_dd = 'html body.catalog-product-view div.wrapper div.page div.main-container div.main div.col-main div.product-view div.product-essential form div.product-shop select'
pack_size_obj = root.cssselect(css_sel_price_dd)
print 'This strain has a drop down select box for different pack sizes: '
print pack_size_obj
pack_size = pack_size_obj[0].text_content().encode('utf-8').strip()
print 'Pack Size: ' + pack_size
得到以下结果：
This strain has a drop down select box for different pack sizes:
[<SelectElement 10e77d590 name='super_attribute[501]'>]
Pack Size: Choose an Option...
但到目前为止，我无法访问其他选项中的文本值，即5和10
<option value="33">5</option>
<option value="31">10</option>
仍然无法正常工作 - 这里是带有网址等的实际代码段
import lxml.html
import requests
import csv
user_agent = {'User-agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/536.26.17 (KHTML, like Gecko) Version/6.0.2 Safari/536.26.17'}
# Open a session
s = requests.session()
s.get('http://www.seedsman.com/en/cannabis-seeds', headers = user_agent)
css_sel_price_dd = '.product-shop select option'
open_seed_url = 'http://www.seedsman.com/en/amsterdam-mist-feminised-seeds'
print 'From the following URL: ' + open_seed_url
r = s.get(open_seed_url, headers = user_agent)
r_encoding = r.encoding
print 'encoding type of r:'
print r_encoding
myhtml = r.text # gives us a unicode string work with unicode and encode at the end when have piece of data we want
print myhtml.encode('utf-8')
root = lxml.html.fromstring(myhtml)
pack_size_obj = root.cssselect(css_sel_price_dd)
print pack_size_obj
for opt in pack_size_obj:
print '{0} : {1}'.format(opt.get('value'), opt.text)
希望有人能看出出了什么问题？
收益：
From the following URL: http://www.seedsman.com/en/amsterdam-mist-feminised-seeds
encoding type of r: UTF-8
** HTML removed for brevity **
[<Element option at 0x1108dcbf0>]
None : Choose an Option...
[Finished in 3.9s]
您需要将option添加到选择器，然后您将获得选项元素列表。看看这个示例代码片段，只是简化了一下html：
src_html = """
<html>
<head></head>
<body>
<div>
<select id="attribute501" class="required-entry super-attribute-select" name="super_attribute[501]">
<option value="">Choose an Option...</option>
<option value="33">5</option>
<option value="31">10</option>
</select>
</div>
</body>
</html>
"""
root = html.fromstring(src_html)
css_sel_price_dd = 'html body div select option'
pack_size_obj = root.cssselect(css_sel_price_dd)
for opt in pack_size_obj:
print '{0} : {1}'.format(opt.get('value'), opt.text)
你可以使用xpath
options = root.xpath("//select[@id='attribute501']/option")
option_text = [option.text for option in options]
要么
options = root.xpath("//select[@id='attribute501']/option/text()")