The previous 10 crawler notes on the ground continue to record some simple Python crawler knowledge,
Used to solve the simple bar download, performance point calculation naturally.
However, in order to bulk download a large number of content, such as all the questions and answers, it is not a bit more than the edge.
As a scrapy, the reptile frame is on the way!
Scrapy
Crawl the site of the code implementation a lot, if considering the crawl to download a lot of content scrapy framework is undoubtedly a good tool. Scrapy = Search+pyton. The installation process is briefly listed below. PS: Be sure to download the Python version, or you will be reminded that Python is not found when y
from GitHub warehouses (master and stable branches). Scrapy the installation method on the version after Ubuntu9.10 is as follows:
Copy Code code as follows:
sudo apt-key adv--keyserver hkp://keyserver.ubuntu.com:80--recv 627220E7
Copy Code code as follows:
Echo ' Deb Http://archive.scrapy.org/ubuntu scrapy main ' | sudo tee/etc/apt/sources.list.d/scrapy.list
Copy
Summary: Scrapy,python develops a fast, high-level screen capture and Web Capture framework for crawling Web sites and extracting structured data from pages. Scrapy can be used for data mining, monitoring and automated testing in a wide range of applications. The attraction of Scrapy is that it is a framework that any
Python crawling framework Scrapy crawler entry: Page extraction, pythonscrapy
Preface
Scrapy is a very good crawling framework. It not only provides some basic components available in the out-of-the-box environment, but also provides powerful Customization Based on your own needs. This article describes how to extract the Scr
This chapter begins with a case study of the Python scrapy framework, for more information, see: Python Learning Guide
Getting Started case study goals
Create a Scrapy Project
Defining extracted structured data (Item)
Write the spider of a crawl site and extract the Structured data (Item)
Writ
written in front of the words:
Java programmer One, first into the large data god pit, the reptile is the first project, the project details need not repeat, after several struggles finally decided to give up the Java crawler, using Python to
To write a reptile, a Python crawler certainly does not revolve around the scrapy genius frame.
Environment to build and i
Scrapy is a fast screen crawl and Web crawling framework for crawling Web sites and extracting structured data from pages. Scrapy is widely used for data mining , public opinion monitoring and automated testing . 1. Scrapy profile 1.1 scrapy Overall framework
1.2 Scrapy Comp
Create a Scrapy item definition extract item write crawl site spider and extract item write item Pipeline to store extracted item (i.e. data)
Scrapy is written by Python.If you have just contacted and wondered about the nature of the language and the details of scrapy, we recommend Learn python the Hard Way for program
Scrapy:OS: win7Python: 2.7.The first is to install easy_install scrapy is very easy to install, it is difficult to install so many dependent package http://doc.scrapy.org/en/0.16/intro/install.html here there are Windows installation instructionsIf it is really compiled, or to install too many win stuff, go to http://www.lfd.uci.edu /~ Gohlke/pythonlibs/download a compiled library for Installation
Step 1: Create a project
/unix/./configuremakemake install
Installing Redis
The process of installing Redis is very simple and the specific tutorials are available on the website. Specific as follows: Http://redis.io/downloadCopy the code code as follows:cd /usr/local/src$ wget http://download.redis.io/releases/redis-3.0.5.tar.gztar zxvf redis-3.0.5.tar.gzcd redis-3.0.5makemake PREFIX=/usr/local/redis installWhere Prefix=/usr/local/redis can be omitted and, in the case of ellipsis, Redis is installed by de
downloaded Verification Code 3, here is the need to manually input, here can access code platform:P Aram Response: : return: '' With open (' captcha.jpg ', ' WB ') as F:f.write (Response.body) f.close () Try: im = Image.open (' captcha.jpg ') im.show () im.close () Except:pass captcha = Input ("Please enter your verification >") return scrapy. Formrequest (url= ' https://www.zhihu.com/#signin ', Headers=s
96. python version 3.6 required, which was not fount in the registry (install scrapy in python3.6), fountscrapy
Problems encountered during scrapy Installation
Environment: win10 (64-bit), Python3.6 (64-bit)
Install scrapy:
1. Install wheel (after installation, the software can be installed through the wheel file)
pip3
https://sourceforge.net/projects/pywin32/files/pywin32/Build%20220/.Downloaded: Pywin32-220.win-amd64-py3.6.exe, Note: The file format is:. exe1. Double-click File 2. Keep Down (note: There will be a selection of installation paths: D:\python3\)
Installing Scrapy
Finally install the scrapy, the command is as follows:PIP3 Install ScrapySometimes, an error occurs when you execute the install sc
The first 10 crawler notes have continued to record some simple Python crawler knowledge,Used to solve the simple paste download, the performance point of the calculation of natural.But if you want to bulk download a lot of content, such as all the questions and answers, it seems to be a bit more than a point.As a scrapy, the reptile frame is just like this!Scrapy
Python crawler path of a salted fish (5): scrapy crawler framework, pythonscrapy
Introduction to scrapy crawler framework
Installation Method pip install scrapy. I use the anaconda command to install scrapy for conda.
1. The Engine obtains a Request from the Spider)2Engi
1 #-*-coding:utf-8-*-2 3 #Define Here the models for your scraped items4 #5 #See documentation in:6 #http://doc.scrapy.org/en/latest/topics/items.html7 8 Importscrapy9 Ten One classAmazonitem (scrapy. Item): A #Define the fields for your item here is like: - #name = Scrapy. Field () -description=Scrapy. Field
) Triggering events based on conditionsNo user modification requiredDownloaderDownload Web pages on requestNo user modification requiredSchedulerScheduling management of all crawl requestsNo user modification requiredDownloader MiddlewareObjective: To implement engine, scheduler and downloaderUser-configurable controls betweenFeatures: Modify, discard, add request or responseUser can write configuration codeSpider(1) Parsing the response returned by Downloader (Response)(2) Generating a crawl it
Python crawls the data worth buying in the rebate Network (v1 single thread, non-scrapy framework), pythonscrapy
First, use the previous method to crawl the data of the rebate network. The scrapy framework is not skilled yet, and then fight scrapy tomorrow.
The beautifulsoup module is used to find the target data.
1. O
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