Equivalent of Python string.format in Go?

Question

In Python, you can do this:

\"File {file} had error {error}\".format(file=myfile, error=err)

or this:

\"File %(file)s had e         


        

Answer 1

You can try the Go Formatter library that implements replacement fields surrounded by curly braces {} format strings similar to Python format.

Working code example Go Playground:

package main

import (
    "fmt"

    "gitlab.com/tymonx/go-formatter/formatter"
)

func main() {
    formatted, err := formatter.Format("Named placeholders {file}:{line}:{function}():", formatter.Named{
        "line":     3,
        "function": "func1",
        "file":     "dir/file",
    })

    if err != nil {
        panic(err)
    }

    fmt.Println(formatted)
}

Output:

Named placeholders dir/file:3:func1():