LOAD_PATH, meaning of the content

General Usage
1 
julia> LOAD_PATH
3-element Vector{String}:
 "@"
 "@v#.#"
 "@stdlib"

What does the three elements here mean?

I am interested in this variable because I saw the following code at the beginning of a script

push!(LOAD_PATH, joinpath(dirname(@__FILE__), "src"))

It seems that the purpose is to add the direcoty ‘src’ besides the current file into the path.

2

As we’ve said before, please remember to look at the julia help before asking here. Use ?LOAD_PATH in the REPL. If that doesn’t fully answer your question, then please specify which parts remain unclear.

1 Like
3 
help?> LOAD_PATH
search: LOAD_PATH

  LOAD_PATH

  An array of paths for using and import statements to
  consider as project environments or package directories
  when loading code. It is populated based on the
  JULIA_LOAD_PATH environment variable if set; otherwise it
  defaults to ["@", "@v#.#", "@stdlib"]. Entries starting
  with @ have special meanings:

    •  @ refers to the "current active environment",
       the initial value of which is initially
       determined by the JULIA_PROJECT environment
       variable or the --project command-line option.

    •  @stdlib expands to the absolute path of the
       current Julia installation's standard library
       directory.

    •  @name refers to a named environment, which are
       stored in depots (see JULIA_DEPOT_PATH) under
       the environments subdirectory. The user's named
       environments are stored in ~/.julia/environments
       so @name would refer to the environment in
       ~/.julia/environments/name if it exists and
       contains a Project.toml file. If name contains #
       characters, then they are replaced with the
       major, minor and patch components of the Julia
       version number. For example, if you are running
       Julia 1.2 then @v#.# expands to @v1.2 and will
       look for an environment by that name, typically
       at ~/.julia/environments/v1.2.

  The fully expanded value of LOAD_PATH that is searched for
  projects and packages can be seen by calling the
  Base.load_path() function.

  See also JULIA_LOAD_PATH, JULIA_PROJECT, JULIA_DEPOT_PATH,
  and Code Loading.
2 Likes