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Date: Thu, 20 Oct 2016 00:57:04 -0700 (PDT)
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Subject: Re: Where to find good/simple examples for gnatcoll (python)?
From: briot.emmanuel@gmail.com
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Xref: news.eternal-september.org comp.lang.ada:32144
Date: 2016-10-20T00:57:04-07:00
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If you only want to execute a python script (and perhaps get the output as a
string), you could try:

   Python : constant Scripting_Language :=
       Lookup_Scripting_Language (Repo, "python");
   GNATCOLL.Scripts.Execute_Command (Python, "2 + 3");

Now, if you want to get the result, this is a little more complicated. Assuming you
want to call a foo() function in python, you have to prepare an object with the arguments,
and that will receive the return value.

    Data : Callback_Data'Class := Create (Python, 0);
    Result : Integer;
    Data.Execute_Expression ("2+3");   --  newer versions of gnatcoll
    Result := Data.Return_Value;

or

    Data : Callback_Data'Class := Create (Python, 2);
    Result : Integer;
    Data.Set_Nth_Arg (1, 2);
    Data.Set_Nth_Arg (2, 3);
    Data.Execute_Command ("foo");   --  newer versions of gnatcoll
    Result := Data.Return_Value;