Programmer Think

I believe many of my friends are players who love the hero League. The skin production of the hero League is still relatively exquisite. Xiaobian, who has a collection hobby, plans to climb down the skin of the official website with a crawler. Next, let's see how Xiaobian uses python to climb the skin of the hero League! (python crawler source ...

Several common Excel libraries openpyxl, xlrd/xlwt, xlwings and xlsxwriter are explained in detail. In order to further understand the similarities and differences of each library, so that it can be used flexibly in different scenarios, this paper will horizontally compare 7 common modules that can operate Excel files, and consolidate learning ...

A detailed explanation of the usage of special permissions for SetUID (SUID) files 1 Introduction [root@localhost ~]# ls -l /usr/bin/passwd -rwsr-xr-x. 1 root root 22984 Jan 7 2007 /usr/bin/passwd It can be seen that the x permission bit originally represents the permission of the file owner, but the s permission appears. This permission ...

HashMap source code nanny level analysis Jdk1.0 is used here 7 jdk1. 8 becomes a node node. First analyze 1.7 and then 1.8 1, What is a hash table hash table It is a very important data structure with rich application scenarios. The core of many caching technologies (such as memcached) is to maintain a large hash table in memory. This paper ...

1, Introduction to Ajax (1) What is Ajax? Ajax = asynchronous JavaScript and XML;Ajax is a technology for creating fast and dynamic web pages;Ajax can make web pages update asynchronously by exchanging a small amount of data with the server in the background. This means that a part of the web page can be updated without reloading the whole we ...

Color and moving object recognition system 1. Development tools Python version: Anaconda's Python environment version 3.8 Development software: pycham Community Edition Recognition model: deep learning model, general learning model Related modules: opencv python = 3.4.8.29 module 2. Environmental construction Install Anaconda and add the path t ...