Question from the Go test

type MyStruct struct {
    func Create() {
        // code...
    }
}

type MyStruct struct {
}

func (s MyStruct) Create() {
    // code...
}

type MyStruct struct {
}

func Create(self MyStruct) {
    // code...
}

type MyStruct struct {
}

def (s MyStruct) Create() {
    // code...
}