Running a simple Python from Ada program

["Rego, P." <pvrego@gmail.com>]

Does someone would have a simplest as possible way to run a Python script from the Ada project?

The Python script in this case only has a print in a loop, with a sleep, so each iteration it should print the arguments. 

The Python script I'm using is
import sys
import time

for index in range(10):
    print(sys.argv)
    time.sleep(1)

On approach I am trying is running this one as a batch script, so using 
import sys
import time

with Text_IO;
with Interfaces.C; use Interfaces.C;
procedure systest2 is
   function Sys (Arg : Char_Array) return Integer;
   pragma Import(C, Sys, "system");
   Ret_Val : Integer;
begin
   Ret_Val := Sys(To_C("python testpy.py arg1 arg2"));
   
end systest2;

The problem is that the execution blocks the script, meaning that the Python printouts are only printed at the end of the execution, at once. 

I know that there is a solution (to run Python from Ada) based on GNATCOLL, but I couldn't find any example to run it.

Tnx