From Go 1.22 (expected release February 2024), you will be able to write:

for i := range 10 {
    fmt.Println(i+1)
}

(ranging over an integer in Go iterates from 0 to one less than that integer).

For versions of Go before 1.22, the idiomatic approach is to write a for loop like this.

for i := 1; i <= 10; i++ {
    fmt.Println(i)
}

Today (2024/02/08), the spec has been updated to the latest version.

According to the spec, the only syntax allowed is this:

for i := range n {
    //...
}

• n is a (possibly untyped) integer expression.

• It iterates from 0 to n - 1. (n is exclusive.)

• If n <= 0, the loop iterates nothing.

• Only one loop variable can be specified. (for i, j := 10 is (naturally) invalid.)

• Unlike in Python, you cannot specify a step or iterate in reverse order.

Example:

playground

package main

import "fmt"

func main() {
    for i := range 5 {
        fmt.Println(i) //=> 0 1 2 3 4
    }

    var i int
    for i = range 1 + 2 {
        fmt.Println(i) //=> 0 1 2
    }

    for i := range 0 {
        fmt.Println(i) //compiles but not executed
    }

    for i := range -1 {
        fmt.Println(i) //compiles but not executed
    }
}