how to parse appengine app.yaml file about go-gypsy HOT 7 CLOSED

handlers, err := yaml.Child(config.Root, "handlers")
// handle err
lst, ok := handlers.(yaml.List)
// handle !ok
for i := 0; i < lst.Len(); i++ {
  node := lst.Item(i);
  // use node
}

       config, err := yaml.ReadFile(dst+"/app.yaml")
       if err != nil {
               fmt.Printf("readfile(%q): %s", dst+"/app.yaml", err)
       }
       handlers, err := config.Get("handlers")
        lst, ok := handlers.(yaml.List)
        if !ok {
                return
        }
        for i := 0; i < lst.Len(); i++ {
                node := lst.Item(i)
                vals := node.(yaml.Map)
                fmt.Printf("%+v\n%+T\n", vals, vals)
        }

invalid type assertion: handlers.(yaml.List) (non-interface type string on left)

        handlers, err := yaml.Child(config.Root, "handlers")
        if err != nil {
                return
        }
        lst, ok := handlers.(yaml.List)
        if !ok {
                return
        }
        for i := 0; i < lst.Len(); i++ {
                node := lst.Item(i)
                vals := node.(yaml.Map)
                fmt.Printf("%+v\n%+T\n", vals, vals)
        }

interface conversion: interface is nil, not yaml.Map

diff --git a/yaml/types.go b/yaml/types.go
index c28ed61..ceaf4c6 100644
--- a/yaml/types.go
+++ b/yaml/types.go
@@ -69,7 +69,7 @@ func (node List) Len() int {

 // Get the idx'th item from the List.
 func (node List) Item(idx int) Node {
-       if idx < 0 || idx > len(node) {
+       if idx >= 0 && idx < node.Len() {
                return node[idx]
        }
        return nil