Shulou(Shulou.com)06/03 Report--

In this issue, the editor will bring you about what data the crawler can use HTTP agent to collect. The article is rich in content and analyzes and describes for you from a professional point of view. I hope you can get something after reading this article.

For crawlers, the threshold for learning reptiles is very low, especially through Python. Even on the Internet, you can find many ways to learn about crawlers, which are good at data collection. For example, you can collect thousands of web pages for analysis. With very valuable data, you can not only understand the situation of your peers, but also influence the decisions of the company.

What information can a crawler collect.

1. Images, text and videos will crawl product (store) reviews and various photo sites.

To obtain image resources and comment text data. In fact, it is easy to master the right method so that you can get data from mainstream websites in a short period of time.

2. As the original data of machine learning and data mining.

For example, if you want to build a recommendation system, you can climb to more dimensional data and build a better model.

3. Carry out market research and business analysis.

Find high-quality answers, screen high-quality content; retrieve real estate website information, analyze housing prices trend, analyze housing prices in different regions; obtain job information in recruitment websites, analyze the talent demand and salary level of various industries.

Which kind of crawler can be used for reference by reptiles?

4. Crawlers usually change the limits of IP addresses.

Typically, they change IP after one or more collections, because LAN restricts Internet users' ports, target sites, protocols, games, instant messaging software, etc., and can access the site. To break through these restrictions, IP needs to use the proxy IP and change the IP to increase the number of visits.

5. Using the HTTP agent, you can also hide the true identity of the user.

Visit some servers that don't want the other person to know about your IP, grab some data, and so on.

When using a crawler, if the acquisition is too fast, a CAPTCHA is usually displayed to confirm whether the current visitor is a human or a crawler. To get the CAPTCHA, you need to analyze the characters in your CAPTCHA picture.

The above is what data the crawler shared by the editor can use HTTP agent to collect. If you happen to have similar doubts, please refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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