Best Python Web Crawling Tools : Python Crawler Library

Hands-On Python Crawler to Avoid Site Blocking

Engaged in the old iron network crawler should have experienced this scene: just write a good crawler script running well, suddenly stopped. At this time, it is likely that the target site to block your real IP! Don't worry.Proxy IPs are the cure for this problem.. Today let's nag how to use Python + proxy IP to build a King Kong crawler system.

Python Crawler Essentials 3-Piece Kit

Let's start with a few crawling tools that are recognized as good in Python circles:
Requests(Easy to follow),Scrapy(professional-grade framework),Selenium (computing)(against dynamic web pages). Each of these three guys has their own specialty, but none of them can do it without the help of a proxy IP.

 Example of using a proxy with Requests
import requests

proxies = {
    'http': 'http://用户名:密码@ipipgo proxies:port',
    'https': 'https://用户名:密码@ipipgo proxies:port'
}

response = requests.get('destination URL', proxies=proxies)

Proxy IP real combat skills open to the public

It's not enough to know how to use a proxy.Don't step on these potholes.::
1. Don't use free proxies (slow and insecure)
2. Remember to set a timeout (3-5 seconds recommended)
3. To randomly switch User-Agents (the site will hold a grudge)
4. Don't be tough when it comes to CAPTCHA (don't hesitate to go to coding platforms)

Why choose ipipgo proxy service?

There are so many proxy service providers on the market, but theipipgo has three brushes.::
1. Coverage of 300+ city nodes nationwide (even in remote areas)
2. Exclusive IP Survival Detection Technology (Automatic Replacement of Dropped Lines)
3. Support for HTTPS/Socks5 dual protocol (what environment can be used)
4. Provide a proprietary API interface (on-demand without waste)

Frequently Asked Questions First Aid Kit

Q: What should I do if my proxy IP is not working after I use it?
A: It is recommended to use ipipgo's automatic rotation function, their IP pool is automatically refreshed every 5 minutes, which does not give the website a chance to block the IP at all.

Q: How to test whether the proxy IP is effective?
A: Test it with this code first:

import requests

test_url = 'http://httpbin.org/ip'
response = requests.get(test_url, proxies=proxies)
print(response.text) The IP shown here should not be the local IP

Q: Does the crawler need to have more than one agent open at the same time?
A: It's a must! We recommend using ipipgo's concurrency package, their IP pool supports100+ switches per second, perfectly matched to the needs of distributed crawlers.

The Ultimate Crawler Configuration Program

I've got a recommendation for all you veteran drivers out there.golden combination::
Scrapy framework + ipipgo proxy middleware + random request header. Configured in this way, the site basically can not tell whether you are a real person or a machine, the collection efficiency directly pull full!

 Scrapy Middleware Configuration Example
class IpipgoProxyMiddleware.
    def process_request(self, request, spider).
        request.meta['proxy'] = 'http://ipipgo动态API地址'
         Automatically add authentication information
        request.headers['Proxy-Authorization'] = basic_auth_header('Account', 'Password')

One last rant. Getting a crawler is like guerrilla warfare.IP is your ammunition.. With a reliable proxy service like ipipgo, data collection will be half successful. If you don't understand anything, feel free to take a look at their official website, the document is written in a very practical way.