cannot import name 'linkExtractor' from 'scrapy.linkextractors' (D:\apps\pachong\venv\Lib\site-packages\scrapy\linkextractors\__init__.py)
时间: 2023-08-14 19:03:02 浏览: 45
这个错误是因为在Scrapy中没有名为'linkExtractor'的模块。正确的模块名是'LinkExtractor',首字母L要大写。请确保你的代码中使用了正确的模块名。你可以尝试修改导入语句为以下形式:
```python
from scrapy.linkextractors import LinkExtractor
```
如果问题仍然存在,请确保你已经安装了正确的版本的Scrapy,并且模块路径正确。如果问题仍然无法解决,请提供更多的代码和错误信息,以便我能够更好地帮助你解决问题。
相关问题
scrapy+mongodb案例
下面是一个使用 Scrapy 和 MongoDB 的简单示例,它将爬取豆瓣电影 Top 250 的数据并存储到 MongoDB 数据库中:
1. 安装 Scrapy 和 pymongo:
```
pip install scrapy pymongo
```
2. 创建 Scrapy 项目:
```
scrapy startproject douban
```
3. 在 `settings.py` 文件中配置 MongoDB:
```
MONGODB_HOST = 'localhost'
MONGODB_PORT = 27017
MONGODB_DBNAME = 'douban'
MONGODB_COLLECTION = 'movies'
```
4. 创建一个名为 `items.py` 的文件,定义要爬取的数据字段:
```
import scrapy
class DoubanItem(scrapy.Item):
title = scrapy.Field()
rating = scrapy.Field()
director = scrapy.Field()
actors = scrapy.Field()
year = scrapy.Field()
country = scrapy.Field()
category = scrapy.Field()
```
5. 创建一个名为 `douban_spider.py` 的文件,定义爬虫:
```
import scrapy
from douban.items import DoubanItem
from scrapy.spiders import CrawlSpider, Rule
from scrapy.linkextractors import LinkExtractor
class DoubanSpider(CrawlSpider):
name = 'douban'
allowed_domains = ['movie.douban.com']
start_urls = ['https://movie.douban.com/top250']
rules = (
Rule(LinkExtractor(allow=('subject/\d+/$')), callback='parse_item'),
Rule(LinkExtractor(allow=('top250\?start=\d+')), follow=True)
)
def parse_item(self, response):
item = DoubanItem()
item['title'] = response.css('h1 span::text').get()
item['rating'] = response.css('strong.rating_num::text').get()
item['director'] = response.css('a[rel="v:directedBy"]::text').get()
item['actors'] = response.css('a[rel="v:starring"]::text').getall()
item['year'] = response.css('span.year::text').get()
item['country'] = response.css('span[property="v:initialReleaseDate"]::text').re_first(r'(\S+)\s+\(\S+\)')
item['category'] = response.css('span[property="v:genre"]::text').getall()
yield item
```
6. 运行爬虫:
```
scrapy crawl douban
```
7. 在 MongoDB 中查看数据:
```
> use douban
> db.movies.find().pretty()
```
Scrapy多线程爬取
Scrapy支持多线程爬取,可以使用Python的threading模块和Queue模块实现。以下是一个简单的示例,展示如何在Scrapy中使用多线程爬取:
```python
import threading
from queue import Queue
import scrapy
from scrapy.crawler import CrawlerProcess
from scrapy.spiders import CrawlSpider, Rule
from scrapy.linkextractors import LinkExtractor
class MySpider(CrawlSpider):
name = 'example.com'
allowed_domains = ['example.com']
start_urls = ['http://www.example.com']
rules = (
Rule(LinkExtractor(), callback='parse_item', follow=True),
)
def parse_item(self, response):
# 解析页面的代码
def worker():
while True:
url = q.get()
process = CrawlerProcess()
process.crawl(MySpider, start_urls=[url])
process.start()
q.task_done()
q = Queue()
num_threads = 8
for i in range(num_threads):
t = threading.Thread(target=worker)
t.daemon = True
t.start()
for url in urls:
q.put(url)
q.join()
```
在这个示例中,我们创建了一个名为MySpider的爬虫,并使用CrawlSpider和LinkExtractor来定义爬取规则。然后,我们创建了一个worker函数,该函数从队列中获取URL并使用CrawlerProcess启动爬虫。最后,我们创建了8个线程,并将URL添加到队列中。
需要注意的是,在使用多线程爬取时,需要适当调整并发请求限制和队列容量,以避免资源冲突和性能问题。