How to call a function in embeded python code in delphi?

[Tom]

delphi 7
python 2.3
win98
Python for Delphi V3.25


In Delphi:
1   Create a new Form ;
2   Drop a TMemo(Memo1) to contain python code;
3   Drop a TPythonInputOutput (PythonInputOutput1) ;
4   Drop a TPythonEngine (PythonEngine1) ;
5   Drag a PythonDelphiVar component and name it bx.  Set the VarName 
property to the same as its name;
6   Connect the attribute IO of the TPythonEngine to the 
TPythonInputOutput;
7   Drop a TButton (Button1) ;
8   Write python code in the Memo1 (set Memo1's property of lines):

           def ax(m,n):
                  y=10
                  bx.value=y+m+n
                  ...

Now, As click Button1, how to call the funtion ax passing the 
arguments(such as m=33 and n=25), and get bx.ValueAsString  ;


Delphi Code:

---------------------------

unit Unit1;

interface

uses
   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, 
Forms,
   Dialogs, PythonEngine, StdCtrls;

type
   TForm1 = class(TForm)
     Memo1: TMemo;
     Button1: TButton;
     PythonEngine1: TPythonEngine;
     bx: TPythonDelphiVar;
     PythonInputOutput1: TPythonInputOutput;
     procedure Button1Click(Sender: TObject);
   private
     { Private declarations }
   public
     { Public declarations }
   end;

var
   Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
          /////////////////////////////////////////////////
          //                                             //
          //  How to call the funtion ax passing the     //
          //  arguments(such as m=33 and n=25), and      //
          //  get bx.ValueAsString ??                    // 

          //                                             //
          /////////////////////////////////////////////////


          showmessage( bx.ValueAsString );


end;

end.



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Thank you very much!!