Running python code in Delphi threads

[pyscripter 583]

There have been a lot of questions in this forum about running python code in threads using Python4Delphi.   I have created a comprehensive guide in this Wiki topic.

[Pat Foley 50]

Is a 2006 Programming Python by Mark Lutz still worth reading? Then use your guide to learn how use threads with Python.  Thanks      

[pyscripter 583]

2 hours ago, Pat Foley said:

Is a 2006 Programming Python by Mark Lutz still worth reading?

Python 3 was released in 2008.  I would read something more recent that is based on Python 3.  

 

pamoroso/free-python-books: Python books free to read online or download (github.com)

Edited November 1, 2023 by pyscripter

[David Heffernan 2300]

My recollection of Lutz's work is that Learning Python is the book of his to read.

 

As for the Python 2 vs 3 distinction, I'd be less worried about that. That's more about syntax details than concepts. A really good work written for Python 2 is better than an average work for Python 3. The differences between 2 and 3 aren't significant conceptually. 

[maomao2028 0]

It seems ThreadPythonExec does not work. and memory leak occurs

 

procedure TForm1.Button2Click(Sender: TObject);
begin
  ThreadPythonExec(
    procedure
    begin
      GetPythonEngine.Execstring('print(10)');
    end);
end;

[pyscripter 583]

@maomao2028 Works fine here without memory leaks.   See attached project.

 

Note the use of DelayWrites := True in the PythonGUIInputOutput and the calls to TPythonThread.Py_End_Allow_Threads and TPythonThread.Py_Begin_Allow_Threads.

Demo01.zip