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debug得不到数据，直接运行数据库内也没有任何数据？麻烦老师给解答一下。

来源：14-12 获取和解析详情页 - 1

燚燚生辉

2019-09-09

debug时如下图，没有值

图片描述

代码如下:

import re
from urllib import parse
import requests
import time
from scrapy import Selector
from csdn_spider.rewrite_models import *
from selenium import webdriver
from datetime import datetime

domain = "https://bbs.csdn.net"  # 域名


def get_nodes_json():
    left_menu_text = requests.get("https://bbs.csdn.net/dynamic_js/left_menu.js?csdn").text
    nodes_str_search = re.search("forumNodes:(.*])",left_menu_text)
    if nodes_str_search:
        nodes_str = nodes_str_search.group(1).replace("null","None")
        nodes_list = eval(nodes_str)
        return nodes_list
    return []

url_list = []

def process_nodes_list(nodes_list):      #获取所有的URL
    #将json的格式提取出url到list
    for item in nodes_list:
        if "url" in item:
            if item["url"]:
                url_list.append(item["url"])
            if "children" in item:
                process_nodes_list(item["children"])


def get_level1_url(nodes_list):
    level1_url = []
    for item in nodes_list:
        if "url" in item:
            if item["url"]:
                level1_url.append(item["url"])
    return level1_url

def get_last_urls():
    #获取最终的抓取url
    nodes_list = get_nodes_json()
    process_nodes_list(nodes_list)
    level1_url = get_level1_url(nodes_list)
    all_urls = []
    for url in url_list:
        if url not in level1_url:
            all_urls.append(url)

    last_urls = []

    for url in all_urls:
        last_urls.append(parse.urljoin(domain,url))  #待解决
        last_urls.append(parse.urljoin(domain, url +"/recommend")) #推荐精华
        last_urls.append(parse.urljoin(domain, url + "/closed")) #已解决
    return last_urls

def parse_topic(url):
    #获取帖子详情及回复

    pass





def parse_author(url):
    pass



def parse_list(url):
    #解析列表页内容
    res_text = requests.get(url,cookies = cookie_dict).text
    sel = Selector(text = res_text)
    all_trs = sel.xpath("//table[@class = forums_tab_table]/tbody//tr")
    for tr in all_trs:
        status = tr.xpath(".//td[1]/span/text()").extract()[0]
        score = tr.xpath(".//td[2]/em/text()").extract()[0]
        topic_url = parse.urljoin(domain, tr.xpath(".//td[3]/a/[@herf]").extract()[0])
        topic_id = tr.xpath(topic_url.split("/"))[-1]
        topic_title = tr.xpath(".//td[3]/a/text()").extract()[0]
        author_url = parse.urljoin(domain, tr.xpath(".//td[4]/a/[@herf]").extract()[0])
        author_id = author_url.split("/")[-1]
        create_time_str = tr.xpath(".//td[4]/em/text()").extract()[0]
        create_time = datetime.strptime(create_time_str, "%Y-%m-%d %H:%M")
        answer_info = tr.xpath(".//td[5]/span/text()").extract()[0]
        answer_nums = answer_info.split("/")[0]
        click_nums = answer_info.split("/")[1]
        last_time_str = tr.xpath(".//td[6]/em/text()").extract()[0]
        last_time = datetime.strptime(last_time_str, "%Y-%m-%d %H:%M")

        topic = Topic()
        try:
            topic.id = int(topic_id)
        except:
            continue
        topic.title = topic_title
        topic.author = author_id
        topic.create_time = create_time
        topic.answer_nums = int(answer_nums)
        topic.click_nums = int(click_nums)
        topic.score = int(score)
        topic.status = status
        topic.last_answer_time = last_time
        existed_topic = Topic.select().where(Topic.id == topic.id)
        if existed_topic:
            topic.save()
        else:
            topic.save(force_insert=True)


    #     parse_topic(topic_url)
    #     parse_author(url)
    #
    # next_page = sel.xpath("//a[@class = 'pageliststy next_page']/@heref").extracr()
    # if next_page:
    #     next_page_url = parse.urljoin(domain,next_page[0])
    #     parse_list(next_page_url)


if __name__ == "__main__":
    browser = webdriver.Chrome(executable_path="E:/python/Chrome_Drive_win32/chromedriver.exe")
    browser.get("https://www.csdn.net")
    time.sleep(5)
    cookie_dict = {}
    cookies = browser.get_cookies()
    for item in cookies:
        cookie_dict[item["name"]] = item["value"]
    last_urls = get_last_urls()
    for url in last_urls:
        print(url)
        parse_list(url)

能打印输出正确的URL

E:\Python\python.exe "E:\Pycharm\PyCharm 2019.1.1\helpers\pydev\pydevd.py" --multiproc --qt-support=auto --client 127.0.0.1 --port 50400 --file E:/python/项目/csdn_spider/rewrite_spider.py
pydev debugger: process 15692 is connecting

Connected to pydev debugger (build 191.6605.12)
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Process finished with exit code 0
写回答

1回答

bobby

2019-09-10

你有没有试过逐行调试代码。逐行调试代码是开发人员必备的技能。你看看哪一行代码没有达到预期：

    1. html返回格式是否正确？

    2. 解析是否正确？

    3. good对象是否正确？是不是调用了save方法没有入库？

0
0

Python爬虫工程师实战 大数据时代必备

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