Programmer Think

1, IP proxy pool (relatively simple, subsequent updates) Two protocols are used to verify ip and proxies, http and https import re import requests url = 'https://tool.lu/ip' headers = { 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36 Edg/96.0.1054.62' } ...

Original link: http://tecdat.cn/?p=17526Original source: Tuo end data tribal official accountThis paper presents an algorithm, which can switch between mean regression and trend following strategy according to market volatility. Two models are studied: one uses historical volatility and the other uses Garch (1,1) volatility prediction. The mean ...

Article catalog 1. Algorithm efficiency2. Time complexity3. Space complexity 1.1 algorithm efficiency There are two kinds of algorithm efficiency analysis: the first is time efficiency and the second is space efficiency. Time efficiency is called time complexity, Spatial efficiency is called spatial complexity. The time complexity main ...

1, Knowledge needed xpath syntax, data type conversion, basic crawler. xpath is suitable for data cleaning when the web page data is html, so as to achieve the purpose of extracting data. I recommend a particularly easy-to-use plug-in, xpath helper. If you need me, you can chat with me in private. I will update the installation tutorial and ...

1 Introduction 1.1 introduction to price demand elasticity The economics course talks about price demand elasticity, which describes the elasticity of demand quantity with the change of commodity price. Generally, price does not directly affect demand, but is mediated by intermediate variables related to user decision-making. Assuming Q ...

The daily question selects the frequently asked interview questions, summarizes them into a column, and uses spare time to escort the career. It is recommended that you think and answer the questions independently. Hello, in the process of data job recruitment, we often investigate the SQL ability of job seekers. Here are three frequently test ...

What we need to do in this chapter is to use data. The purpose of data analysis is to use our data and combine my business to get some results we need to know. Then the first step of analysis is modeling, building a prediction model or other models; After we get to the results of this model, we need to analyze whether my model is reliable enoug ...

@TOC 1 Background description Normally, the growth process of a company's number of customers in one line of business is similar to the population growth in a region. Generally, it will go through these growth stages, namely, silence, growth, explosion, stability. The trend curve of the whole process conforms to the "S" curve. Takin ...

In this part, Mr. Songtian explained the application of relevant knowledge of re database. Next, we will crawl the information of Taobao commodity page in combination with requests database. Note: crawler practice is only for learning, not for commercial use. If there is infringement, please contact to delete! Target page: Taobao Search Tao ...

Refer to the following: setup/HowToCreatePluginsInProM – prom Hello World plugin Plug in definition package org.processmining.plugins.gettingstarted; import org.processmining.contexts.uitopia.annotations.UITopiaVariant; import org.processmining.framework.plugin.PluginContext; import org.processmining.framework.plugin.annotations.Plugin; ...