How to include the package in local directory in to the main.go

Question

I am using go version go1.11.2 windows/amd64 in windows 10

i have folder in desktop with name "GoPro" which has one file - main.go one folder - Modules

The "Modules" folder contains one file - Modules.go

Folder Structure

Desktop
   |------->GoPro
               |----->main.go
               |----->Models
                          |---->Models.go

main.go

// desktop/GoPro/main.go 

package main

import (
    "./Models"
)

func main() {
    Models.Printhello()
}

Models.go

// desktop/GoPro/Models

package Models

import "fmt"

func Printhello() {
    fmt.Println("Hello")
}

If try to run the main.go , I am getting the below error , Go recongise the package but it saying undefined.

go run main.go

command-line-arguments

.\main.go:8:2: undefined: Models

The folder is not in GOPATH. I am just trying to import the package with in sub folder of main.go

Please read How to Write Go Code. You do not import files but packages and probably your package is not called "Models". Also: Do not use relative imports as this is a stupid idea. — Volker
Is there perhaps a duplicate that explains why relative imports are a bad idea? — ᆼᆺᆼ
@Volker Why relative imports are stupid idea. In many website I saw , people are saying not to use relative imports. I am just trying to port my codes form Python to Go, In python all my additional packages are imported relative path. To maintain the same structure I am trying to import packages in relative path. — Arvindh
Relative imports do not play well along all the tooling. Using full qualified import paths is dead simple and will result in a project structure which works well. Spending 5 minutes to convert to full import paths is much less work than wasting hours fiddling with relative imports. Relative imports turned out to be a stupid idea and using them will result in needless problems. You can still maintain the same file system structure, all you need to do is use non-relative import paths. It really is that simple. And please: Decapitalise the model name!! — Volker

Eli Bendersky Eli Bendersky · Accepted Answer · 2019-02-13T14:27:41

You can either set up $GOPATH and place your library in a path relative to $GOPATH, or use modules.

For modules, you can do something like:

$ tree
.
├── go.mod
├── main.go
└── mylib
    └── mylib.go

Contents of files:

$ cat go.mod
module myproject.com

====

$ cat main.go 
package main

import "myproject.com/mylib"

func main() {
    mylib.Say()
}

====

$ cat mylib/mylib.go 
package mylib

import "fmt"

func Say() {
    fmt.Println("Hello from mylib")
}

P.S. use lowercase to name packages/modules

How to include the package in local directory in to the main.go

command-line-arguments

1 Answers