1、书籍附带的文件，python网络爬虫实例教程4.1爬q房，最简单的一个爬虫未显示错误，练习很久了，视频也看了，书也一条一条对照，不管怎么调试，print什么内容，检查URL和Xpath都没有错误，但是没内容？
2、
from lxml import etree
import requests
import csv
import time

def data_writer(item):

with open('qfang.csv', 'a',encoding='utf-8',newline='') as csvfile:
    writer = csv.writer(csvfile)
    writer.writerow(item)

def spider():

headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36'}
pre_url = 'http://shenzhen.qfang.com/sale/f'
for x in range(1,11):
    html = requests.get(pre_url + str(x), headers=headers)
    time.sleep(1)
    selector = etree.HTML(html.text)
    house_list = selector.xpath("//*[@id='cycleListings']/ul/li")
    for house in house_list:
        xiaoqu = house.xpath("div[1]/p[1]/a/text()")[0]
        huxing = house.xpath("div[1]/p[2]/span[2]/text()")[0]
        mianji = house.xpath("div[1]/p[2]/span[4]/text()")[0]
        quyu = house.xpath("div[1]/p[3]/span[2]/a[1]/text()")[0]
        zongjia = house.xpath("div[2]/span[1]/text()")[0]
        item = [xiaoqu, huxing, mianji, quyu, zongjia]
        data_writer(item)
        print('正在抓取', xiaoqu)

if name == '__main__':

spider()

3、C:UserspcPycharmProjectsuntitledvenvScriptspython.exe "C:/Users/pc/Desktop/python学习/爬虫电子书/Python爬虫实例教程-代码/4.1 qfang.py"
h

进程完成，退出码 0
4、notebooks、Geany、Visual Studio Code、JetBrains PyCharm 2019.1.1 x64都试了，不缺第三方库、也print不出内容，CSV也没生成。