Tag：Full name
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Pandas’s handling of missing values
Pandas uses these functions to handle missing values: Isnull and notnull: detect whether it is a null value, which can be used for DF and series Dropna: discard and delete missing values Axis: delete row or column, {0 or ‘index’, 1 or ‘columns’}, default 0 How: if it is equal to any, any value will […]
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C + + address book management system
Code copy #include #include #include #define MAX 1000 using namespace std; //Design contact structure struct Person { //Name string m_Name; //Gender: 1 male and 2 female int m_Sex; //Age int m_Age; //Telephone string m_Phone; //Address string m_Addr; }; //Design address book structure struct Addressbooks { //Contact array saved in address book struct Person personArray[MAX]; //Number […]
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Study day 29
C language Structure array Define structure array Individually defined struct a { int m; int d; int y; }; struct b { int xuhao; char ming[]; int xingbie; int nianling; char dizhi; struct a rqi;// Structure sleeve structure }; int main() { struct b c[5];// Individually defined Define when defining structure struct a { int […]
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Instead of H5, use pywebio module to realize web page directly
The biggest advantage of pywebio is that it can write web pages like terminal scripts, and obtain users’ input and output at the browser level by providing a series of interactive functions. [read the full text] Running effect under pycharm editor Running effect under IPython editor Installing the python web plug-in pip3 install -U pywebio […]
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C# final assignment – student achievement management
Operation requirements Student achievement management （1）class Student { int id; string name; int score; Student next; } (2) It is implemented with linked list or system list class. It can also be implemented with an array (up to 100 records)? (3) Add: check that the student number is not duplicate (4) Delete: if an integer […]
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Spring boot quick start (V): use mybatis (annotation form) for database operation
Add dependency For the new project, select three dependencies: Web, mybatis and mysql For existing projects, you can use bulid Add gradle and spring boot will help you configure it automatically compile(‘org.springframework.boot:spring-boot-starter-data-jpa’) compile(‘org.springframework.boot:spring-boot-starter-web’) runtime(‘mysql:mysql-connector-java’) testCompile(‘org.springframework.boot:spring-boot-starter-test’) Basic configuration information Then in Src / main / resources / application Add basic configuration under properties #Database connection address […]
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Springboot 2.2.5 uses AOP to configure dynamic switching of multiple data sources, supports transactions, and solves the problem of AOP aspect failure when calling internal methods
The blog is mainly to record their own learning process, which is convenient for later viewing. Of course, I hope it can help you. explain As the number of application users increases, the number of corresponding concurrent requests will also increase. Slowly, a single database can no longer meet our frequent database operation requests. In […]
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Python basic case exercise: making student information management system
I preface Student information management system, I believe everyone has done it more or less Recently, many students’ homework is to make a student information management system Therefore, today I will take you to make a simple student information management system II Development environment: The development environment I use Python 3.8 Pycharm 2021.2 III Knowledge […]
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SQL interview 50 questions – learning record (I)
These 50 questions are classic SQL questions on the Internet. First try to write them yourself, and then compare them with the teacher’s writing method. In this process, I will paste up my mistakes and the teacher’s writing method and my writing method. Of course, there may be some places where the consideration is not […]
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Mysql-34 classic query exercises (with answers and analysis)
First, you need to create and initialize the data of employee table, department table and salary grade table: DROP TABLE IF EXISTS EMP; DROP TABLE IF EXISTS DEPT; DROP TABLE IF EXISTS SALGRADE; CREATE TABLE DEPT ( DEPTNO int(2) NOT NULL, DNAME VARCHAR(14), LOC VARCHAR(13), PRIMARY KEY (DEPTNO) ); CREATE TABLE EMP ( EMPNO int(4) […]
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C + + address book management system (add contact, display contact, delete contact, find contact, modify contact, empty contact, exit address book)
1 /** 2 * projectnmae: address book management system 3 * function: 4 * add contact: add a new person to the address book 5 * display contact: displays all contact information in the address book 6 * delete contact: delete the specified contact by name 7 * Find Contact: view the specified contact information […]
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Online English name random generator
Online English name random generator Online English name random generator The tool supports batch random generation of English names. The maximum number of generated names for all genders is 1000 and the maximum number of specified genders is 500. It can be used for testing and so on. https://tooltt.com/english-name/