julia - 在我的 Julia 1.0.0 REPL 中，LOAD_PATH 返回意外结果

Question

我的 Julia REPL 帮助为 LOAD_PATH 提供了以下内容:

help?> LOAD_PATH
search: LOAD_PATH

  LOAD_PATH

  An array of paths for using and import statements to consdier as project environments or package directories when
  loading code. See Code Loading.

这是我在提示符下的 LOAD_PATH 输出:

julia> LOAD_PATH  # What is the output below?
3-element Array{String,1}:
 "@"
 "@v#.#"
 "@stdlib"

上面显示的 LOAD_PATH 输出看起来很奇怪。

有什么建议？

Answer 1

你在那里看到的是 DEFAULT_LOAD_PATH .

让我引用来自 relevant section of the source code 的评论:

## LOAD_PATH, HOME_PROJECT & ACTIVE_PROJECT ##

# JULIA_LOAD_PATH: split on `:` (or `;` on Windows)
# first empty entry is replaced with DEFAULT_LOAD_PATH, the rest are skipped
# entries starting with `@` are named environments:
#  - the first three `#`s in a named environment are replaced with version numbers
#  - `@stdlib` is a special name for the standard library and expands to its path

换句话说，

"@" : 用于加载相对于当前路径的内容(此处不完全确定，请参阅下面的更新)

"@v#.#" : 将成为v1.0的路径环境(假设您使用的是 1.0)。

"@stdlib" : 将成为标准库的路径

这可能应该在某处的 Pkg 文档中更准确地解释。心灵 filing an issue over there ? (更新:见 https://github.com/JuliaLang/Pkg.jl/issues/757)

更新:

可以玩转方法 Base.load_path_expand(a::AbstractString)看看事情最终会变成什么样:

julia> Base.load_path_expand.(LOAD_PATH.*"/test")
3-element Array{String,1}:
 "\\test\\Project.toml"
 "C:\\Users\\carsten\\.julia\\environments\\v1.0\\test\\Project.toml"
 "C:\\Users\\carsten\\.julia\\environments\\stdlib\\test\\Project.toml"