If interchanging the format (between languages other than go) or reading it as a stream is not important to you, just use the gob
encoder and decoder.
http://golang.org/pkg/encoding/gob/
The idea is that you create an encoder around a writer, or a decoder around a reader, and then just ask them to encode or decode a struct. Encoding goes something like this:
p := []int{1,2,3,4}
encoder := gob.NewEncoder(myFileWriter)
err = encoder.Encode(p)
if err != nil {
panic(err)
}
decoding works just the opposite way:
decoder := gob.NewDecoder(myFileReader)
p := []int{}
err = decoder.Decode(&p)
if err != nil {
panic(err)
}
Alternatively, you can use similar methods available in the standard library, for storing the data as JSON or XML, which allow you more easily to debug things, and open the data from other languages (at the cost of size and efficiency).