xpath lxml无法获取htm的ul标记内的所有元素

Question

我对lxmlxpath有一个问题，下面的示例代码用于获取Ul中带有xpath的标记Li的所有数据：

"//*[@id ="s-results-list-atf"]/li/@data-asin".

奇怪的是，我只收到6里，而有46里

有人请帮我指出错误所在

p/s：使用python 2.7

from lxml import html
import csv, os, json
import random
import requests
from exceptions import ValueError
from time import sleep

def getAsin():
    headers_list = [
        {
            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2211.90 Safari/537.36'},
        {
            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2111.90 Safari/537.36'},
        {
            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.3211.90 Safari/537.36'},
        {
            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2221.90 Safari/537.36'},
        {
            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2212.90 Safari/537.36'},
        {
            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2213.90 Safari/537.36'},
        {
            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2214.90 Safari/537.36'},
        {
            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2215.90 Safari/537.36'},
        {
            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2216.90 Safari/537.36'},
        {
            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2217.90 Safari/537.36'},
        {
            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2218.90 Safari/537.36'},
        {
            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2219.90 Safari/537.36'},
        {
            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2231.90 Safari/537.36'},
        {
            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2241.90 Safari/537.36'},
    ]
    headers = random.choice(headers_list)
    url = 'https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=t-shirts&rh=i%3Aaps%2Ck%3At-shirts'
    page = requests.get(url, headers=headers)
    while True:
        sleep(3)
        try:
            doc = html.fromstring(page.content)
            XPATH_NAME = '//*[@id="s-results-list-atf"]/li/@data-asin'
            RAW_NAME = doc.xpath(XPATH_NAME)
            print 'aaaaaaaaa',RAW_NAME
            if page.status_code != 200:
                raise ValueError('captha')
            return RAW_NAME
        except Exception as e:
            print e
if __name__ == "__main__":
    getAsin()

`

Answer 1

似乎并非所有列表项都出现在list"#s-results-list-atf"

尝试使用

doc.xpath('//li[starts-with(@id, "result_")]/@data-asin')

获取完整列表（60项）