Export participants to different formats

* CSV
* PDF (requires Python dependency `weasyprint`)
* ODS (requires Python dependency `pyexcel_ods3`)

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/service/python_port.ex

@@ -0,0 +1,28 @@
+defmodule Mobilizon.PythonPort do
+  @moduledoc """
+  Port to use Python modules from Elixir
+  """
+
+  use Export.Python
+
+  @doc """
+  ## Parameters
+    - path: directory to include in python path
+  """
+  @spec python_instance(String.t()) :: pid
+  def python_instance(path) do
+    python = "/usr/bin/python3"
+
+    {:ok, pid} = Python.start(python: python, python_path: path)
+
+    pid
+  end
+
+  @doc """
+  Call python function using MFA format
+  """
+  @spec call_python(pid, binary, binary, list) :: any
+  def call_python(pid, module, function, arguments \\ []) do
+    Python.call(pid, module, function, arguments)
+  end
+end