For crawlers, the barrier to learning crawlers is very low, especially through Python. Even on the Internet, you can find lots of ways to learn about crawlers, which are good for data collection. For example, you can collect thousands of web pages to analyze. Bring valuable data, not only to learn about your peers, but also to influence your company's decisions.
What information can crawlers collect?
1. Images, text and video will crawl product (store) reviews and various image sites.
To obtain image resources and comment text data. In fact, it's easy to learn the right way to get data from major sites in the short term.
2. As raw data for machine learning and data mining.
For example, if you want to build a recommendation system, you can crawl into more dimensional data and build a better model.
3. Conducted market research and business analysis.
Looking for high-quality answers and screening high-quality content; Search the information of real estate websites, analyze the trend of housing prices, and analyze the housing prices of different regions; Obtain job information from recruitment websites, analyze talent demand and salary level of various industries.
Which kind of crawler can be used for reference by crawlers?
1. Crawlers usually change IP address restrictions.
Typically, they change the IP after collecting once or more, because the LAN limits Internet users' ports, target sites, protocols, games, instant messaging software, and so on, and can access that site. To overcome these limitations, an IP needs to use a proxy IP and change the IP to increase access times.
2. With HTTP proxies, you can also hide the user's real identity.
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