Tormenator1
I’m still learning Elixir,and am making a basic elixir program to call a function from a python program. I am attempting to use erlport to do so. However, in the code below Erlport is undefined. I don’t see what could be causing it.
defmodule RarFile do
@moduledoc """
Documentation for `RarFile`.
"""
@doc """
Hello world.
## Examples
iex> RarFile.hello()
:world
"""
def extractor(filepath) do
{:ok, pid} = :erlport.open_port({:spawn, "python"}, [:binary, :stream, packet: 4])
end
end
Here is the mix.exs file that I’m using.
defmodule RarFile.MixProject do
use Mix.Project
def project do
[
app: :rar_file,
version: "0.1.0",
elixir: "~> 1.14",
start_permanent: Mix.env() == :prod,
deps: deps()
]
end
# Run "mix help compile.app" to learn about applications.
def application do
[
extra_applications: [:logger]
]
end
# Run "mix help deps" to learn about dependencies.
defp deps do
[
{:erlport, "~> 0.10"}
# {:dep_from_hexpm, "~> 0.3.0"},
# {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
]
end
end
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benwilson512
hi @Tormenator1 please always include a copy and paste of the exact error when asking about an error.
In glancing at the docs found here ErlPort - Python documentation the function you are trying to use is never mentioned, are you sure you’re calling a function that exists?
kokolegorille
You are confusing erlport eith Elixir Port, they are not the same…
You should do something like this example…
al2o3cr
FWIW,
open_portis a built-in Erlang function.Erlport provides wrappers to open ports to Python and Ruby executables, you should use one of those if that’s what you’re looking to do.
Tormenator1
I have multiple python environments on the development machine. How would I select a specific one?
Also, when enetering the first line of code you provided I get this error.
(SyntaxError) keyword argument must be followed by space after: python:
|
18 | {ok, PythonInstance1} = python:start()
| ^
Stacktrace:
│ (elixir 1.14.4) lib/kernel/parallel_compiler.ex:340: anonymous fn/5 in Kernel.ParallelCompiler.spawn_workers/7
kokolegorille
No idea how is your setup…
But starting my release with Systemd, I can pass Python environment variables.
kokolegorille
That is not Elixir code, but Erlang, it should be…
… in Elixir. And beware with the strings, they are not really the same between Elixir and Erlang
Tormenator1
I am using this exact line when i get the error above.
Elixir thinks that this is a syntax error.
I get a similar error when I try this line from the language docs
Why exactly would this be happening?
kokolegorille
Erlport is an Erlang package, so the doc is written in Erlang…
I advise You to read this page, if You want to translate from Erlang to Elixir
kokolegorille
No, I did not provide code written in Erlang
Tormenator1
So the python file is called handler.py and the function I am calling is called hey. It accepts 1 string parameter.
How would I call that function in this code. I’m unclear about what is meant to be passed into the call function in terms of the module parameter?