A basic process Create a project, the project name is (cmd): firstblood: scrapy startproject firstblood Enter the project directory (cmd): cd :./firstblood Create a crawler file (cmd): scrapy gens
Tag: reptile
Reptral high performance related
High performance related How to achieve multiple tasks at the same time and high efficiency
The lowest efficiency is the most undesirable
import requests
urls = [
‘http://www.baidu
Reptile technology
1, scrapy (python crawler) 2, pyspider (python crawler) 3. Crawler4j (java stand-alone crawler) 4. WebMagic (java stand-alone crawler) 5. WebCollecto (java stand-alone crawler) 6, Heritrix (java crawler) )
Reptile SCRAPY Component Request Metallization, POST Request, Middleware
Use the post request in the scrapy component to call
def start_requests(self):
Transfer parameters and then return yield scrapy.FormRequest(url=url,formdata=data,callback=self.parse)
Make a
Reptile tips
Crawler Tips First of all, what python crawler modules have you used? I believe most people will reply to requests or scrapy, well I mean most people. But for simple crawlers, let’s habitually use
Reptile – picture lazy loading solution
Dynamic data loading processing
I. Lazy loading of pictures
#!/usr/bin/env python
# -*- coding:utf-8 -*-
import requests
from lxml import etree
if __name__ == “__main__”:
url =
Reptral performance analysis and optimization
We wrote a single-task version of the crawler to crawl the user information of Zhenai.com two days ago. What about its performance?
We can take a look at the network utilization. We can see t
Graduate reptile (1)
The objects processed by the crawler are links, titles, paragraphs, and pictures.
baidu
xxxx
xxxx
There are two types of links that must be excluded:
1, internal Jump link
xxxx
2, the link
Incremental reptile
Introduction:
When we browse related webpages, we will find that some websites will regularly update a batch of data on the basis of the original webpage data. For example, a movie website wi
[Reptile] Load version of the producer and consumer model
”’
Lock version Producer and consumer model
”’
import threading
import random
import time
gMoney < /span>= 1000 # Original amount
gLoad = threading.Lock()
gTime = 0 # production times
class Prod