numpy and TTask about python4delphi HOT 8 CLOSED

Please see https://github.com/pyscripter/python4delphi/wiki/PythonThreads

from python4delphi.

Unfortunately, nothing works. None of the methods given in the article. There is simply no response. I have logging, but nothing is written in the log.

What am I doing wrong? Python embedded version is 3.8. Delphi 11.3

Here is my code:

    ThreadPythonExec(
    procedure
    begin
      GetPythonEngine.ExecFile(PyFileName);
    end{, nil, false, emNewInterpreter});

    Task := TTask.Create(
        procedure
        var
          Py: IPyEngineAndGIL;
        begin
          Py := SafePyEngine;
          Py.PythonEngine.ExecFile(PyFileName);
        end);
    Task.Start;

from python4delphi.

Are you doing this?

You should call Py_Begin_Allow_Threads in your main thread, after the python DLL was loaded, for example in your FormCreate event handler.

Also have a look at Demo 33.

from python4delphi.

Thanks for the help, it really worked. But the problem hasn't completely disappeared.
I call TPythonThread.Py_Begin_Allow_Threads when I create a form. I also call TPythonThread.Py_End_Allow_Threads when closing the form. Everything is fine, everything works fine. But if I close the form and start the form again, then there is a problem in the script with the numpy module again(other packages seem to be fine). I get an error:

C:\A\34\s/Objects/structsseq.c:398: bad argument to internal function

When I close the form, I unload the dll:

procedure TfrmScripts.FormDestroy(Sender: TObject);
begin
PyEngine.UnloadDll;
TPythonThread.Py_End_Allow_Threads; // Acquire the GIL
FreeAndNil(PyEngine);
inherited;
end;

What am I doing wrong?

from python4delphi.

Why do you free the engine?

Destroying and recreating the engine is not a good idea.

from python4delphi.

I create PythonEngine dynamically on form create. But it doesn't make any difference. Even if I use TPythonEngine component (put ting it on a form, so I don't need destroy it on closing form), still this error occurs. I have an MDI application. What do you recommend?

Put TPythonEngine component in Data Module?

Destroying and recreating the engine is not a good idea.
Why?

from python4delphi.

It makes no difference if you put the PythonEngine on a Form or a DataModule. Are you releasing the GIL before running python code again?

I am not sure what causes the error in your program, but this is not a P4D issue. You may get some help if you use the Support forum.

from python4delphi.

Are you releasing the GIL before running python code again?

on form create:
TPythonThread.Py_Begin_Allow_Threads;

on form destroy:
TPythonThread.Py_End_Allow_Threads;

from python4delphi.