Question

在Python中，我有一个包含html表元素的变量，如下所示：

page = requests.get('http://www.myPage.com')
tree = html.fromstring(page.content)
table = tree.xpath('//table[@class="list"]')

table变量具有以下内容：

<table class="list">
      <tr>
        <th>Date(s)</th>
        <th>Sport</th>
        <th>Event</th>
        <th>Location</th>
      </tr>
      <tr>
        <td>Jan 18-31</td>
        <td>Tennis</td>
        <td><a href="tennis-grand-slam/australian-open/index.htm">Australia Open</a></td>
        <td>Melbourne, Australia</td>
      </tr>
</table>

我试图像这样提取标题：

rows = iter(table)
headers = [col.text for col in next(rows)]
print "headers are: ", headers

但是，当我打印headers变量时，我得到了这个：

headers are:  ['\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n
      ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n
', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n        ', '\n
        ', '\n        ', '\n        ']

如何正确提取标题？

Answer 1

试试这个：

from lxml import html

HTML_CODE = """<table class="list">
      <tr>
        <th>Date(s)</th>
        <th>Sport</th>
        <th>Event</th>
        <th>Location</th>
      </tr>
      <tr>
        <td>Jan 18-31</td>
        <td>Tennis</td>
        <td><a href="tennis-grand-slam/australian-open/index.htm">Australia Open</a></td>
        <td>Melbourne, Australia</td>
      </tr>
</table>"""

tree = html.fromstring(HTML_CODE)
headers = tree.xpath('//table[@class="list"]/tr/th/text()')
print "Headers are: {}".format(', '.join(headers))

<强>输出：

Headers are: Date(s), Sport, Event, Location

Answer 2

使用该表并假设只有一个：

table[0].xpath("//th/text()")

或者，如果您只想要表格中的标题，并且不打算将其用于其他任何您需要的内容：

headers = tree.xpath('//table[@class="list"]//th/text()')

两者都会给你：

['Date(s)', 'Sport', 'Event', 'Location']

无法获取表头元素

2 个答案: