找不到包“rsc.io/报价”

Question

我按照教程(https://golang.org/doc/tutorial/getting-started)开始使用Go，我已经遇到了一个问题。当我运行以下代码时：

package main

import "fmt"

import "rsc.io/quote"

func main() {
    fmt.Println(quote.Go())
}

我在我的控制台中得到以下错误消息：

C:\Users\myname\Documents\Work\GO\hello>go run hello.go
hello.go:7:8: cannot find package "rsc.io/quote" in any of:
        C:\Program Files\Go\src\rsc.io\quote (from $GOROOT)
        C:\Users\myname\go\src\rsc.io\quote (from $GOPATH)

我猜这是我安装到哪里的一个问题，有人能给我一点启示吗？

谢谢

Answer 1

具有模块支持的go工具会自动下载和安装依赖项。但要使其工作，您必须初始化您的模块。

仅将源代码保存在.go文件中并与go run hello.go一起运行是不够的，必须存在go.mod文件。

要插入您的模块，请按照本教程中的说明执行：

go mod init hello

产出应是：

go: creating new go.mod: module hello
go: to add module requirements and sums:
        go mod tidy

从go 1.16开始，您还必须运行

go mod tidy

它将自动下载rsc.io/quote包：

go: finding module for package rsc.io/quote
go: found rsc.io/quote in rsc.io/quote v1.5.2

所以下一次跑步

go run hello.go

将产出：

Don't communicate by sharing memory, share memory by communicating.

Answer 2

在命令提示符下运行此命令：

go mod tidy

然后执行您的代码：

go run file_name.go

用go文件示例替换file_name.go：

go run hello.go

Answer 3

2021/6/3 go版本go1.16.4 linux/amd64 64

root@zqf-vm:/workspace/go_workspace/hello# go mod init hello
go: creating new go.mod: module hello
go: to add module requirements and sums:
        go mod tidy
root@zqf-vm:/workspace/go_workspace/hello# go run hello.go 
hello.go:6:2: no required module provides package rsc.io/quote; to add it:
        go get rsc.io/quote
root@zqf-vm:/workspace/go_workspace/hello# go mod init hello
go: /workspace/go_workspace/hello/go.mod already exists
root@zqf-vm:/workspace/go_workspace/hello# go run hello.go 
hello.go:6:2: no required module provides package rsc.io/quote; to add it:
        go get rsc.io/quote
root@zqf-vm:/workspace/go_workspace/hello# go mod tidy
go: finding module for package rsc.io/quote
go: downloading rsc.io/quote v1.5.2
go: found rsc.io/quote in rsc.io/quote v1.5.2
go: downloading rsc.io/sampler v1.3.0
go: downloading golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c
root@zqf-vm:/workspace/go_workspace/hello# go run hello.go 
Don't communicate by sharing memory, share memory by communicating.