Use the log.Println function in golang to print log information

Title: Use the log.Println function in Golang to print log information

Logs are very important in software development. They can help us track various problems during program operation. Information such as errors, warnings, debugging information, etc. In Golang, there is a built-in log package, which provides many functions to handle log output. One of the commonly used functions is log.Println, which prints log information to standard output.

The following is a simple sample code that shows how to use the log.Println function to print log information:

package main

import (
    "log"
)

func main() {
    // 打印一条普通的日志信息
    log.Println("This is a log message")

    // 打印一条带有变量的日志信息
    name := "John Doe"
    log.Println("User name:", name)

    // 打印一条带有格式化字符串的日志信息
    age := 30
    log.Printf("User age: %d
", age)

    // 打印一条错误日志信息
    err := doSomething()
    if err != nil {
        log.Println("An error occurred:", err)
    }
}

func doSomething() error {
    // 模拟发生了一个错误
    return nil
}

In the above example, we first imported the log package. Then, we use the log.Println function to print different types of log information. In the first example, we print a simple log message. In the second example, we print log information with variables. In the third example, we use the log.Printf function to print log information with a formatted string. In the last example, we demonstrate how to print error log information when an error occurs.

It should be noted that the log.Println function will print time and date information by default, as well as the log information itself. If you don't want time and date information, you can use log.SetFlags(0) to disable them.

In addition to the log.Println function, the log package also provides some other useful functions, such as log.Printf, log.Fatalln, log.Panicln, etc. You can choose the appropriate function to print log information according to your needs.

In short, logs are an essential part of our software development. By using the log.Println function in Golang, we can easily print various types of log information. I hope the above sample code can help you better understand and use the log.Println function. If you have any questions, please leave a message to communicate!

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