如何在Xpath Python中施放可变量

Question

    from __future__ import unicode_literals
import requests
from scrapy.selector import Selector
def fetch_page(url):
    r = requests.get(url)
    return r.text
def upso_list_from_listpage(url):
    html = fetch_page(url)
    sel = Selector(text=html)
    upso_lists = []
    for i in range ( 1, 31 ):
        upso_list = sel.xpath ( '//*[@id="List_['"+i+"']"]/div[4]/span/a/text()').extract()
        upso_list.append ( upso_lists )
    #upso_list = sel.xpath('//*[@id="List_0"]/div[4]/span/a/text()').extract()
    #upso_list = sel.css('.nclicks(mai.text1)').extract()
    return upso_lists
from pprint import pprint
pprint(upso_list_from_listpage('http://mokorea.com/ajax/makeBusinessList.php?_method=get&grp=&major=4&cat=&keyword=&hchar=&recom=&page=1&dist=500&gLat=59.8767&gLong=30.4016'))

我想阅读多行。谁能帮助我将XPath更改为变量？我的xpath增加如（list_0，list_1，list_2，list_3 ...）

Answer 1

您的代码将是：

for i in range ( 1, 31 ): 
    upso_list = sel.xpath ( '//*[@id="List_' + str(i) + '"]/div[4]/span/a/text()').extract()