Python crawler can be used to collect data. This is also the most direct and commonly used method. Because the crawler program is a program, the program runs very fast and will not feel tired because of repeated things, so it is very simple and fast to use the crawler program to obtain a large amount of data.

Because more than 99% websites are developed based on templates, a large number of pages with the same layout and different contents can be generated quickly by using templates. Therefore, as long as a crawler program is developed for a page, the crawler program can also grab the content of different pages generated based on the same template.

Step 2 study

For example, to investigate a home appliance company and want to know their commodity sales. The company claims that its monthly sales amount to several hundred million yuan. If you use a crawler to capture the sales of all products on the company's website, then you can calculate the actual total sales of the company. In addition, if you grab all the comments and analyze them, you can also find out whether there is a brush list on the website. Data will not lie, especially massive data. Artificial fraud is always different from natural fraud. In the past, it was very difficult to collect data because of a large amount of data. Now, with the help of reptiles, many cheating behaviors will be exposed to the sun naked.

3, brush flow and peak

Brush traffic is an inherent function of python crawler. When a crawler visits a website, if the crawler hides well and the website cannot recognize that the visit comes from a crawler, it will be regarded as a normal visit. As a result, the crawler "accidentally" brushed the traffic of the website.

In addition to brushing traffic, you can also participate in various spike activities, including but not limited to grabbing goods, coupons, air tickets and train tickets on various e-commerce websites. Nowadays, many people on the internet specialize in using reptiles to participate in various activities and make money from them. This kind of behavior is generally called "bonus hunter", and this kind of person is called "Wool Party". However, the use of reptiles for profit in bonus hunter is actually in the legal gray area. I hope you don't try.