Web Crawling with Python BeautifulSoup: A Tutorial on Parsing HTML in Python

Hands-on teaching you to use Python to crawl data without blocking the IP

Do crawl the biggest headache is to be blocked IP, today we will nag how to use Python's BeautifulSoup with proxy IP to deal with this matter. Don't panic, even if you're a beginner, follow to do can understand.

Why do I need a proxy IP?

To give a chestnut, you go to the neighbor's house every day to borrow soy sauce, borrow three days in a row, people will be annoyed. Web servers are the same way, found that the same IP repeated visits, minutes to pull you black. This is the time you need toProxy IP services from ipipgoIt's the equivalent of changing into a different outfit every time you go to borrow soy sauce, so people won't recognize you.

 Proxy IP Comparison
Normal access -> websites see your real IP -> easily blocked
Use ipipgo proxy -> websites see random IP -> safe collection

Get ready for your stuff.

Install these two libraries first (skip if you've installed them):

pip install requests
pip install beautifulsoup4

Here's the point. Go.ipipgo official websiteSign up for an account, they have free trial credits for new users. Once we get the API interface, we can get the proxy IP dynamically.

Basic Crawler Process

Take crawling an e-commerce site as an example:

import requests
from bs4 import BeautifulSoup

 Getting a proxy from ipipgo (the point!)
def get_proxy():
    return {
        'http': 'http://用户名:密码@gateway.ipipgo.com:9020',
        'https': 'http://用户名:密码@gateway.ipipgo.com:9020'
    }

url = 'https://目标网站.com'
response = requests.get(url, proxies=get_proxy())
soup = BeautifulSoup(response.text, 'html.parser')
 Write your parsing logic here...

How to connect proxy IP is reliable

Three key points to remember:

1. Change IPs with every request (use ipipgo's auto switching feature)
2. Don't set the timeout for more than 10 seconds
3. Remember to handle exceptions (sudden IP change failures)

try.
    response = requests.get(url, proxies=get_proxy(), timeout=8)
except.
    print("This IP is not working well, change it now!")
     Automatically triggering ipipgo's IP replacement mechanism

What do I do if I encounter backcrawling?

Common defenses and cracking methods for websites:

Frequently Asked Questions QA

Q: Proxy IPs are not working when I use them?
A: Choose ipipgo's dynamic residential proxy, their IP pool is automatically refreshed every 5 minutes, simply can't be used up!

Q: What should I do if I slow down in crawling data?
A：在ipipgo后台开启「高速通道」，他们家的BGP线路实测能压到80ms以下

Q: How can I tell if a proxy is in effect?
A: Put a check in the code:

print(response.request.headers['X-Forwarded-For']) What is shown here should be a proxy IP

A final word.

Crawler this thing is like hide-and-seek, the more tightly the site defense, the more we have to be flexible. Useipipgo's Intelligent Proxy SystemI remember that their unique secret is the "IP pool auto-cleaning" function, which can automatically filter the invalid nodes. Don't use those free proxies anymore, when the time comes the data didn't climb to but delayed effort, do you think it's not the right thing to do?