Python Extract HTML Forms: Python Crawler Forms Extraction Tutorial

Table grabbing secrets that even a novice can understand

Old drivers who engage in data collection know that encountering a web form is like digging into a gold mine. However, many newbies with requests+bs4 combo, often by the anti-climbing mechanism beaten to the nose. This is the time to bring out our secret weapon - theThe Great Proxy IP RotationThe

Hands-On Teaching to Disassemble Web Forms

Let's look at this live code first (remember to install requests and beautifulsoup4 first):

import requests
from bs4 import BeautifulSoup

 Important! Put the proxy armor on here
proxies = {
    'http': 'http://用户名:密码@gateway.ipipgo.com:端口',
    'https': 'http://用户名:密码@gateway.ipipgo.com:端口'
}

resp = requests.get('destination URL', proxies=proxies)
soup = BeautifulSoup(resp.text, 'html.parser')

 Lock table tags
for table in soup.find_all('table'):
     Handle table headers
    headers = [th.text.strip() for th in table.find_all('th')]

     Grab rows
    for row in table.find_all('tr'):: [td.text.strip('tr')]: [th.text.strip('th')]
        cells = [td.text.strip() for td in row.find_all('td')]
        if cells.
            print(dict(zip(headers, cells)))

Pay attention to the Proxy Settings section, this is the correct position to use the ipipgo service. Their API automatically changes IPs, which saves you a lot of work over manually cutting IPs.

Proxy IP Selection with Care

Different business to choose the right type of proxy, take the ipipgo package as a chestnut:

A practical guide to avoiding the pit

Recently, when I helped a client to catch the data of an e-commerce company, I found that they used the TK line agent with outstanding results. The specific operation is:

1. Generating API links in the ipipgo backend
2. Set up automatic IP change every 5 minutes
3. Pause for 10 minutes if you encounter a CAPTCHA

After this operation, the data integrity rate directly soared from 47% to 92%, and the customer almost sent me a banner.

Frequently asked questions on demining

Q: What should I do if I can't connect to the proxy IP all the time?
A: Check the whitelist settings, use the ping command to test the gateway, if it does not work hurry to find ipipgo customer service to get a new node

Q: Data grabbing at a snail's pace?
A: Try their cross-border line, or increase the number of concurrency. Remember to add random delay in the code, don't crash their servers!

Q: What should I do if I encounter a dynamically loaded form?
A: on the Selenium + proxy combination, ipipgo's client supports browser auto-configuration, the specific operation of the document in their official website there are

Choosing an agent depends on the doorway

Recently found that many peers planted in the poor quality agent, here to teach you three tricks of the goods inspection skills:

1. Measure IP purity: use whois to check if the attribution is the same as the claimed one
2. Measure connection speed: ping 50 times continuously to see the packet loss rate.
3. Measure anonymity: visit ipcheck to see if the real IP is exposed.

ipipgo is top notch in all three areas, especially their static residential IPs, which are solid for doing data monitoring.

Say something from the heart.

Do crawler this line for seven years, seen too many people can not afford to spend money on the agent, the results of the account was blocked, data scrapped. Now ipipgo's dynamic residential package.Seven bucks more for a G., cheaper than buying coffee. Instead of tossing around free agents, spend a small fortune to stay safe.

Three final reminders for newbies:

• Don't write dead IP addresses in your code.
• Double validation of important data
• Regularly update the agent configuration

All this experience has been gained through blood and tears, so use it and cherish it.