【爬虫实战】python微博热搜榜Top50

一.最终效果

二.项目代码

2.1 新建项目

本文使用scrapy分布式、多线程爬虫框架编写的高性能爬虫，因此新建、运行scrapy项目3步骤：

1.新建项目:
scrapy startproject weibo_hot

2.新建 spider:
scrapy genspider hot_search "weibo.com"

3.运行 spider:
scrapy crawl hot_search

注意：hot_search 是spider中的name

4.编写item：

class WeiboHotItem(scrapy.Item):

    index = scrapy.Field()
    topic_flag = scrapy.Field()
    icon_desc_color = scrapy.Field()
    small_icon_desc = scrapy.Field()
    small_icon_desc_color = scrapy.Field()
    is_hot = scrapy.Field()
    is_gov = scrapy.Field()
    note = scrapy.Field()
    mid = scrapy.Field()
    url = scrapy.Field()
    flag = scrapy.Field()
    name = scrapy.Field()
    word = scrapy.Field()
    pos = scrapy.Field()
    icon_desc = scrapy.Field()

5.编写爬虫解析代码：

import os
from itemadapter import ItemAdapter
from .settings import DATA_URI
from .Utils import Tool

tool = Tool()


class WeiboHotPipeline:

    def open_spider(self, spider):

        self.hot_line = "index,mid,word,label_name,raw_hot,category,onboard_time\n"

        data_dir = os.path.join(DATA_URI)
        file_path = data_dir + '/hot.csv'
        #判断文件夹存放的位置是否存在，不存在则新建文件夹
        if os.path.isfile(file_path):
            self.data_file = open(file_path, 'a', encoding='utf-8')
        else:
            if not os.path.exists(data_dir):
                os.makedirs(data_dir)
            self.data_file = open(file_path, 'a', encoding='utf-8')
            self.data_file.write(self.hot_line)

    def close_spider(self, spider):  # 在关闭一个spider的时候自动运行
        self.data_file.close()

    def process_item(self, item, spider):
        try:

            hot_line = '{},{},{},{},{},{},{}\n'.format(
                item.get('index', ''),
                item.get('mid', ''),
                item.get('word', ''),
                item.get('label_name', ''),
                item.get('raw_hot', ''),
                tool.translate_chars(item.get('category', '')),
                tool.get_format_time(item.get('onboard_time', '')),
            )
            self.data_file.write(hot_line)
        except BaseException as e:
            print("hot错误在这里>>>>>>>>>>>>>", e, "<<<<<<<<<<<<<错误在这里")
        return item

三.注意事项

settings.py配置项修改

# Obey robots.txt rules
ROBOTSTXT_OBEY = False # 关闭，否则根据weibo的爬虫策略爬虫无法获取数据

如果

四.运行过程

五.项目说明文档

六.获取完整源码

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