What are the common problems in python crawlers?
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1. When python web crawlers collect data, they often encounter the anti-web crawler mechanism of the target platform website. If they are lighter, they will be locked in a small black room for a period of time. If they are heavier, they will immediately ban the computer IP address. It is difficult to browse again. At this time python web crawler needs to change IP in time, you can also find free IP on the Internet, or buy professional agent IP, the former IP quantity is small, the product quality is poor, the advantage is cheap. However, with the continuous expansion of data collection scale, free ip simply cannot cope with such frequent crawling frequency, and for network security, it is recommended that everyone choose a professional ip agent.
2. When crawling, because the current website still has certain defense against crawlers, the larger the website, the more it can protect its own data resources and avoid server pressure, so it is very necessary to use a professional proxy ip.
Crawlers often have the problem of IP being banned in crawling data, which is the anti-crawler strategy of the target website. When visiting the website, our IP is recorded. Once the access frequency is too high, it will be identified as a crawler and access to the IP will be prohibited.
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