CODEWITHSUNDEEP
julia
Shayan
Shayan

Reputation: 6355

Dynamically accessing globals through string interpolation

You can call variables through a loop in Python like this:

var1 = 1
var2 = 2
var3 = 3

for i in range(1,4):
    print(globals()[f"var{i}"])

This results in:

1
2
3

Now I'm looking for the equivalent way to call variables using interpolated strings in Julia! Is there any way?

PS: I didn't ask "How to get a list of all the global variables in Julia's active session". I asked for a way to call a local variable using an interpolation in a string.

Upvotes: 1

Views: 111

Answers (3)

ndc85430
ndc85430

Reputation: 1743

You don't. Use a collection like an array instead:

julia> values = [1, 2, 3]
3-element Vector{Int64}:
 1
 2
 3

julia> for v in values
           println(v)
       end
1
2
3

As suggested in earlier comments, dynamically finding the variable names really isn't the approach you want to go for.

Upvotes: 1

Przemyslaw Szufel
Przemyslaw Szufel

Reputation: 42234

List of globals:

vars = filter!(x -> !( x in [:Base, :Core, :InteractiveUtils, :Main, :ans, :err]), names(Main))

Values of globals:

getfield.(Ref(Main), vars)

To display names and values you can either just use varinfo() or eg. do DataFrames(name=vars,value=getfield.(Ref(Main), vars)).

Upvotes: 1

Elias Carvalho
Elias Carvalho

Reputation: 296

PS: this is dangerous.
Code:

var1 = 1
var2 = 2
var3 = 3

for i in 1:3
    varname = Symbol("var$i")
    println(getfield(Main, varname))
end

Upvotes: 3

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