How do you set environment variables in the Go language?

In Go language, environment variables can be set using the os package. Here is an example code demonstrating how to set an environment variable:

package main

import (
    "os"
    "fmt"
)

func main() {
    // 设置环境变量
    os.Setenv("MY_ENV_VAR", "hello")

    // 获取环境变量的值
    myEnvVar := os.Getenv("MY_ENV_VAR")
    fmt.Println("MY_ENV_VAR:", myEnvVar)
}

In the code above, we are using the os.Setenv function to set an environment variable called MY_ENV_VAR.