Article Introduction：Prerequisites Computer basics Basic programming concepts (such as variables, data types, and conditional statements) Install python and necessary libraries (such as pandas, NumPy, and Matplotlib) Step 1: Data import and exploration Use the Pandas library to read in CSV, excel, or database Data exploration of data structures, data types and statistics Find missing values, outliers and data distribution patterns Step 2: Data cleaning Process missing values ​​(e.g. fill with mean or median) Remove duplicates Transform data types (e.g. string Convert to numbers) Normalize the data (e.g. convert different measurement units to the same unit) Step 3: Data Analysis Descriptive Statistics: Calculate statistics such as mean, median, standard deviation, etc.

2024-03-17 comment 0  1193

Article Introduction：PHPPDF to Binary Conversion In web applications, the generation and processing of PDF files are often used, and PHPPDF is a popular PHP library that can be used to generate PDF files. When working with PDF files, the need to convert them to binary format is also common. This article will introduce how to use the PHPPDF library to convert PDF files to binary format. Introduction to PHPPDF library PHPPDF is a pure PHP library used to generate, modify and process PDF files. It can generate pages, images, tables, forms and various

2023-04-03 comment 0  1261

Article Introduction：With the generation and transmission of large amounts of data in various industries, files in CSV format have great advantages in data storage and processing. However, CSV file is not a user-friendly format as it is just a simple text file format and does not provide the functionality of complex operations such as running functions. Therefore, converting CSV files to Excel format files will be more convenient for data use. In PHP, we can use the PHPExcel library to convert CSV files to Excel format files. PHPExcel is a tool specifically designed for PHP development

2023-05-28 comment 0  665

Article Introduction：Form submission: Form submission PHP form submission form name containing a dot () will be converted into an underscore (_): Recently, when I was working on a company project, I discovered a strange problem. When I submitted a normal form, I found that it could not be obtained normally. Submitted value, this discovery made me confused at first. At first, I thought there was a problem with my service and could not write to the database normally. Later, after detecting the SQL statement, I found that the problem actually appeared in the acquisition. In terms of data, the obtained data was all empty. Later, after debugging, it was discovered that all the variables originally submitted to the backend were no longer the expected variables, but had been converted by PHP. The test code is provided as follows: Copy the code The code is as follows:&

2016-07-29 comment 0  902

Article Introduction：PHP timestamps measure the number of seconds from January 1, 1970 00:00:00 UTC to the current time. It is used to record and calculate date and time in PHP. In PHP, a timestamp is an integer representing the number of seconds since the Unix epoch, January 1, 1970 00:00:00 UTC. Therefore, it can be used to convert and compare times. PHP timestamps are 10 or 13 digits, depending on the functions and operations used. In this article, we will look at the two representations of timestamps in PHP and how to use them in code

2023-03-29 comment 0  571

Article Introduction：During the development process of PHP, developers often need to deal with complex logic and state transitions. To better manage and test these states, we can use TestTools to implement state machines and simulators. TestTools is a PHP library that helps us create and manage various testing tools, including state machines and simulators. It provides a set of simple and easy-to-use interfaces that allow developers to quickly create and manage state machines. First, we need to define our state machine. A state machine usually consists of a set of

2023-06-15 comment 0  1816

Article Introduction：The best way to understand Taobao rules is: The best way to understand Taobao rules is 10 things you may not know about PHP: On the other hand, sometimes a difficult problem can be solved with a simple line of code. Here are some cool features that you may not have noticed: Use the ip2long() and long2ip() functions to convert IP addresses into integers and store them in the database. This method reduces the storage space to nearly a quarter (15 bytes for char(15) vs. 4 bytes for integer), it is simpler to calculate whether a specific address is within a range page, and Searching and sorting are made faster (although sometimes just a little faster). Verifying

2016-07-29 comment 0  1034

Article Introduction：Among computer operating systems, WIN7 system is a very classic computer operating system, so how to install win7 system? The editor below will introduce in detail how to install the win7 system on your computer. 1. First download the Xiaoyu system and reinstall the system software on your desktop computer. 2. Select the win7 system and click "Install this system". 3. Then start downloading the image of the win7 system. 4. After downloading, deploy the environment, and then click Restart Now after completion. 5. After restarting the computer, the Windows Manager page will appear. We choose the second one. 6. Return to the computer pe interface to continue the installation. 7. After completion, restart the computer. 8. Finally come to the desktop and the system installation is completed. One-click installation of win7 system

2023-07-16 comment 0  1173

Article Introduction：:This article mainly introduces php-insertion sort. Students who are interested in PHP tutorials can refer to it.

2016-08-08 comment 0  1027

Article Introduction：charles captures requests in eclipse

2016-12-02 comment 0  1662

Article Introduction：Illustrated method to find the path of the PHP configuration file php.ini. Graphical method to find the path of the PHP configuration file php.ini. Recently, some bloggers asked in which directory php.ini exists? Or why does it not take effect after modifying php.ini? Based on the above two questions,

2016-07-13 comment 0  774

Article Introduction：IT House reported on July 14 that Huawei recently released new commercial AI storage products "OceanStorA310 deep learning data lake storage" and "FusionCubeA3000 training/pushing hyper-converged all-in-one machine". Officials said that "these two products can train basic AI models." , industry model training, and segmented scenario model training and inference provide new momentum." ▲ Picture source Huawei IT Home compiled and summarized: OceanStorA310 deep learning data lake storage is mainly oriented to basic/industry large model data lake scenarios to achieve data regression from Massive data management in the entire AI process from collection and preprocessing to model training and inference application. Officially stated that OceanStorA310 single frame 5U supports the industry’s highest 400GB/s

2023-07-16 comment 0  1506

Article Introduction：The difference between the exec function and the shell_exec function in PHP, execshell_exec. The difference between the exec function and the shell_exec function in PHP. Both execshell_exec functions execute Linux command functions. The difference is that the return results are different. exec can only get the last line number.

2016-07-13 comment 0  1021

Article Introduction：Nginx server combines Nginx and tomcat to access jsp

2016-12-02 comment 0  1782

Article Introduction：:This article mainly introduces the PHP function container ing..., students who are interested in PHP tutorials can refer to it.

2016-08-08 comment 0  1078

Article Introduction：Interface usage of PHP object-oriented programming, PHP object-oriented programming. Interface usage in PHP object-oriented programming, PHP object-oriented programming interface is a very important concept in PHP object-oriented programming. This article explains in more detail in the form of examples

2016-07-13 comment 0  965

Article Introduction：PHP object-oriented programming and other constant usage examples, sed usage examples. Examples of constant usage in PHP object-oriented programming, examples of sed usage. Class constants are a very important concept in PHP object-oriented programming. A firm grasp of class constants will help further improve

2016-07-13 comment 0  997

Article Introduction：Java Tutorial—The Difference Between Int and Integer

2016-12-02 comment 0  1959

Article Introduction：Here is a JAVASCRIPT client solution for obtaining URLs with QUESTRING parameters, which is equivalent to ASP's request.querystring and PHP's $_GET

2017-04-24 comment 0  4112

Article Introduction：JavaWeb learning summary_Servlet development

2016-12-02 comment 0  1920