Programmer Think

What is a list List is a very important data type in Python. Why is it so important? Because in our actual development process, list is a data structure that is often used. It is widely used because it takes up less space and wastes less memory space. A list is a queueIt is not only a collection of various data, but also a data structureA ...

1. Creation and initialization of one-dimensional array   1.1 creation of array type_t arr_name [const_n]; //type_t is the element type of the index group //const_n is a constant expression that specifies the size of the array //Code 1 int arr1[10]; //Code 2 int count = 10; int arr2[count];//Try to avoid the array length as variable (vari ...

Smart pointer Why do I need smart pointers Problems with bare pointers Bare pointer is a common pointer defined normally. It has many problems, mainly the following: 1. It is difficult to distinguish whether it points to a single object or an array; 2. After using the pointer, it is impossible to judge whether the pointer should be destroy ...

✿ let's take learning introspection mechanism and reflection as an example 1. Learn new knowledge points - remember the function (first understand what it is, what is the connection and function with the previous knowledge points) (1) What is reflection first? [briefly understand and compare the official description] Simple understanding: r ...

session management Cookie introduction https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Cookies HTTP Cookie (also known as Web Cookie or browser cookie) is a small piece of data sent by the server to the user's browser and saved locally. It will be carried and sent to the server the next time the browser sends a request to the same ...

1,JSON 1.1 JSON description JSON(JavaScript Object Notation) JavaScript object notation (JSON comes from JS).JSON features: JSON is a lightweight data exchange format.JSON adopts a text format that is completely independent of the language, which means that the JSON data of different programming languages are consistent.JSON is easy fo ...

Statement: The information comes from your own arrangement.Reference book crazy Java handout (Fifth Edition) Li Gang © Write 1, Packaging 1.1 general    Java provides two type systems: basic type and reference type. Using basic type is efficient. However, in many cases, objects will be created for use, because objec ...

IO: refers to the flow of data transfer between devices Classification by flow direction: Input stream Output stream Classification by data type: Byte stream A: Byte input stream FileInputStream: FileInputStream fis = new FileInputStream("file name of read data"); Byte buffered input stream: BufferedInputStream Bufferedinput ...

catalogue 1, Introduction to Prometheus monitoring 2, Introduction to Grafana visual monitoring 3, Prometheus monitoring server (default port: 9090) 4, Prometheus monitored node_exporter (default port 9100) 5, Prometheus monitoring Alertmanager (default port 9093) Vi MySQL monitored by Prometheus (default port 9104) VII Redis monitored b ...

day8 dictionary I Cognitive dictionary Dictionary and list selection: When you need to save multiple data at the same time, use the list if the meaning of multiple data is the same (there is no need to distinguish); If multiple data have different meanings, use a dictionary Cognitive Dictionary (dict) """ 1) Is a container data type; take{ ...