Python dictionary data type (dict) in Go
Package dict is a Go implementation of Python dict, which are hashable object maps. Dictionaries complement Go map and slice types to provide a simple interface to store and access key-value data with relatively fast performance at the cost of extra memory. This is done by using the features of both maps and slices.
Install using "go get":
go get github.com/srfrog/dict
Then import from your source:
import "github.com/srfrog/dict"
View example_test.go for an extended example of basic usage and features.
- Initialize a new dict with scalars, slices, maps, channels and other dictionaries.
- Go types int, uint, float, string and fmt.Stringer are hashable for dict keys.
- Go map keys are used for dict keys if they are hashable.
- Dict items are sorted in their insertion order, unlike Go maps.
- Go routine safe with minimal mutex locking (WIP)
- Builtin JSON support for marshalling and unmarshalling
- sql.Scanner support via optional sub-package (WIP)
- Plenty of tests and examples to get you started quickly (WIP)
The full code documentation is located at GoDoc:
http://godoc.org/github.com/srfrog/dict
The source code is thoroughly commented, have a look.
Minimal example showing basic usage:
package main
import (
"fmt"
"github.com/srfrog/dict"
)
type Car struct {
Model, BrandID string
Recalls int
}
func main() {
// Map of car models, indexed by VIN.
// Data source: NHTSA.gov
vins := map[string]*Car{
"2C3KA43R08H129584": &Car{
Model: "2008 CHRYSLER 300",
BrandID: "ACB9976A-DB5F-4D57-B9A8-9F5C53D87C7C",
Recalls: 1,
},
"1N6AD07U78C416152": &Car{
Model: "2008 NISSAN FRONTIER SE-V6 RWD",
BrandID: "003096EE-C8FC-4C2F-ADEF-406F86C1F70B",
Recalls: 5,
},
"WDDGF8AB8EA940372": &Car{
Model: "2014 Mercedes-Benz C300W4",
BrandID: "57B7B707-4357-4306-9FD6-1EDCA43CF77B",
Recalls: 4,
},
}
// Create new dict and initialize with vins map.
d := dict.New(vins)
// Add a couple more VINs.
d.Set("1N4AL2AP4BN404580", &Car{
Model: "2011 NISSAN ALTIMA 2.5 S CVT",
BrandID: "003096EE-C8FC-4C2F-ADEF-406F86C1F70B",
Recalls: 2,
})
d.Set("4T1BE46K48U762452", &Car{
Model: "2008 TOYOTA Camry",
BrandID: "C5764FE4-F1E8-46BE-AFC6-A2FC90110387",
Recalls: 5,
})
// Check current total
fmt.Println("Total VIN Count:", d.Len())
// Print VINs that have 3 or more recalls
for item := range d.Items() {
car, ok := item.Value.(*Car)
if !ok {
continue // Not a Car
}
if car.Recalls < 3 {
continue // Not enough recalls
}
fmt.Println("---")
fmt.Println("VIN:", item.Key)
}
}