从父目录进行相对导入 [英] Relative import from parent directory

问题描述

如何从父目录进行相对导入？

从 meme / cmd / meme ：

  import../../../meme
  

这给出了一个模棱两可的错误：

  matt @ stanley： 〜/ gopath / src / bitbucket.org / anacrolix / meme / cmd / meme $ go get bitbucket.org/anacrolix/meme/cmd/meme 
 
无法加载软件包：/ home / matt /非本地包中的gopath / src / bitbucket.org / anacrolix / meme / cmd / meme / main.go：8：2：本地导入../../../meme
 
 matt @ stanley：〜/ gopath / src / bitbucket.org / anacrolix / meme / cmd / meme $ echo $ GOPATH 
 $ b $ / home / matt / gopath 
  
 
 
如何从父目录本地导入？
解决方案
感谢您添加到您的问题。首先是答案，然后是一些解释。我通过构建你的代码，
 
 
去获取，就像你拥有它一样。 （我忽略了错误消息。）
 
 
将 main.go 中的导入行设置回../../。 ./meme，就像你想做的那样。
 
 
（注释掉一小段包含未使用变量的代码。）
然后在
 
中meme / cmd / meme目录， go run main.go 或 go build main.go 工作。
 > 
 
在我的评论中，当我说去安装工程时，我错了;我应该说，去建设。
 
 
 
然而，关键是单独的 go build 不起作用;你必须输入 go build main.go 。这是因为go命令不允许非本地包中的本地导入。你说得对，规范在这里没有什么帮助。它狡猾地说：ImportPath的解释是依赖于实现的。当前的实施行为是通过 CL 5787055 进行设置的，后来随后是详细讨论Go-nuts。
 
 
 
 本地是指文件系统相对路径。显然，以..开头的相对路径是本地的，所以诀窍就是获取 go 命令将main作为本地包对待。当你键入 go build 时显然没有这样做，但是当你输入 go build main.go 的时候不会这样做。  
How does one do a relative import from a parent directory?

From meme/cmd/meme:
import "../../../meme"
This gives an ambiguous error:
matt@stanley:~/gopath/src/bitbucket.org/anacrolix/meme/cmd/meme$ go get bitbucket.org/anacrolix/meme/cmd/meme

can't load package: /home/matt/gopath/src/bitbucket.org/anacrolix/meme/cmd/meme/main.go:8:2: local import "../../../meme" in non-local package

matt@stanley:~/gopath/src/bitbucket.org/anacrolix/meme/cmd/meme$ echo $GOPATH

/home/matt/gopath
How do I import locally from a parent directory?
解决方案
Thanks for adding to your question.  First, an answer, then some explanation.  I built your code by,

go get, just as you had it.  (I ignored the error messages.)
setting the import line in main.go back to "../../../meme", as you wanted to do.
(commenting out a little bit of code containing an unused variable.)
then in the meme/cmd/meme directory, either go run main.go or go build main.go worked.
I was wrong in my comment earlier when I said go install works; I should have said go build.

The key however is that go build alone does not work; you must type go build main.go.  This is because the go command does not allow "local imports in non-local packages."  You are right that spec is of little help here.  It weasels out saying, "The interpretation of the ImportPath is implementation-dependent."  The current implementation behavior was set with CL 5787055, which was subsequently debated at length on Go-nuts.

"Local" means indicated with a file system relative path.  Obviously a relative path starting with .. is local, so the trick is just getting the go command to treat main as a local package as well.  It apparently doesn't do this when you type go build, but does when you type go build main.go.

                        
这篇关于从父目录进行相对导入的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！