Yaf's hello world example

Introduction to Python functions: Introduction and examples of exec function Introduction: In Python, exec is a built-in function that is used to execute Python code stored in a string or file. The exec function provides a way to dynamically execute code, allowing the program to generate, modify, and execute code as needed during runtime. This article will introduce how to use the exec function and give some practical code examples. How to use the exec function: The basic syntax of the exec function is as follows: exec

The DECODE function in Oracle is a conditional expression that is often used to return different results based on different conditions in query statements. This article will introduce the syntax, usage and sample code of the DECODE function in detail. 1. DECODE function syntax DECODE(expr,search1,result1[,search2,result2,...,default]) expr: the expression or field to be compared. search1,

Introduction to Python functions: Usage and examples of the isinstance function Python is a powerful programming language that provides many built-in functions to make programming more convenient and efficient. One of the very useful built-in functions is the isinstance() function. This article will introduce the usage and examples of the isinstance function and provide specific code examples. The isinstance() function is used to determine whether an object is an instance of a specified class or type. The syntax of this function is as follows

Indentation specifications and examples of Go language Go language is a programming language developed by Google. It is known for its concise and clear syntax, in which indentation specifications play a crucial role in the readability and beauty of the code. effect. This article will introduce the indentation specifications of the Go language and explain in detail through specific code examples. Indentation specifications In the Go language, tabs are used for indentation instead of spaces. Each level of indentation is one tab, usually set to a width of 4 spaces. Such specifications unify the coding style and enable teams to work together to compile

Introduction to Python functions: usage and examples of the abs function 1. Introduction to the usage of the abs function In Python, the abs function is a built-in function used to calculate the absolute value of a given value. It can accept a numeric argument and return the absolute value of that number. The basic syntax of the abs function is as follows: abs(x) where x is the numerical parameter to calculate the absolute value, which can be an integer or a floating point number. 2. Examples of abs function Below we will show the usage of abs function through some specific examples: Example 1: Calculation

Introduction to Python functions: functions and examples of the eval function In Python programming, the eval function is a very useful function. The eval function can execute a string as program code, and its function is very powerful. In this article, we will introduce the detailed functions of the eval function, as well as some usage examples. 1. Function of eval function The function of eval function is very simple. It can execute a string as Python code. This means that we can convert a string

Application and example analysis of PHP dot operator In PHP, the dot operator (".") is an operator used to connect two strings. It is very commonly used and very flexible when concatenating strings. By using the dot operator, we can easily concatenate multiple strings to form a new string. The following will introduce the use of PHP dot operators through example analysis. 1. Basic usage First, let’s look at a basic usage example. Suppose there are two variables $str1 and $str2, which store two words respectively.

Introduction to Python functions: functions and examples of sorted functions Python is a very powerful programming language with a wealth of built-in functions and modules. In this series of articles, we will introduce the commonly used functions of Python one by one and provide corresponding examples to help readers better understand and apply these functions. This article will introduce the functions and examples of the sorted function in detail. The sorted function is used to sort an iterable object and return a new sorted list. Can be used for numbers and words