Update all Demos to Python 3

[pyscripter]

Python 2 has reached the end of its life, and we can assume that most of the users will have installed python 3. Most of the demos use python 2 print statements and some may use other python 2 idioms.

To facilitate experimentation and learning with the demos they should be converted to python 3.

Also all forms should be changed to text format and the old application icon replaced with the default icon.

[drbond]

Agree, especially as the only tutorial seems to be the demos. That isn't the only issue with several of the demos. They appear to have been written for a very old version of Delphi so don't compile in current versions of Delphi because of , for instance, a missing icon.

[pyscripter]

• Demo 1
• Demo 2
• Demo 3
• Demo 4
• Demo 5
• Demo 6
• Demo 7
• Demo 8
• Demo 9
• Demo 10_FireDAC
• Demo 11
• Demo 16
• Demo 17
• Demo 21
• Demo 22
• Demo 23
• Demo 25
• Demo 26
• Demo 27
• Demo 28
• Demo 29
• Demo 30
• Demo 31
• Demo 32
• Demo 33
• Demo 34

[JT-ITStation]

Agree, especially as the only tutorial seems to be the demos. That isn't the only issue with several of the demos. They appear to have been written for a very old version of Delphi so don't compile in current versions of Delphi because of , for instance, a missing icon.

try to open project option and set defaut to icon program

Demo2 work

Demo 3 KO : exeption raise execption :
s_value 'Missing parentheses in call to ''print''. Did you mean print("Python Dll: ", sys.version)? (, line 2)'

[pyscripter]

s_value 'Missing parentheses in call to ''print''. Did you mean print("Python Dll: ", sys.version)? (, line 2)'

In python 3 print is a function:

eg. Python 2
print "Python Dll: ", sys.version
needs to be converted to
print("Python Dll: ", sys.version)

This is what this issue is about.

Note that the code in PythonEngine1.InitScript needs to be changed as well.

[ReinierNL]

Hi Kiriakos, I see you are working on the demos right now.
I wanted to start also now, but not get in your way. Can we divide some tasks?
If you are working from low (3) to high, then let me (unless advised otherwise) start from high (34) to low.

[pyscripter]

Hi Renier, just did Demo 3 to understand what needs to be changed.
I am not planning to do anything else right now. So just feel free to work your way up.

• Don't forget to change the code in the InitScript property
• Get rid of the old icons
• Make the default platform Win64 (I recommend users to install python 64bits)
• Change the fonts in the memos to Consolas size 10.
• In Demo 3 I had to change the Form.Position to Default, so that it looks the right size in a high-dpi monitor.
• Also added the Enable Run Time themes option.

[ReinierNL]

Excellent. Thanks for the instructions :-)
Not sure if I know what you mean by the first bullet though; so far I did not encounter any problems that involved InitScript.
But I'll have a look at it anyway.
Also, about the Form.Position, I'll try to think of it; the thing is I don't have a high dpi monitor here so I won't notice it if something is off there.

[ReinierNL]

And about Demo34: that one is already Python 3 compatible. So you may check the box there.

[ReinierNL]

And Demo02 too. I just converted the dfm to txt in the PR I just submitted.

[pyscripter]

Not sure if I know what you mean by the first bullet though; so far I did not encounter any problems that involved InitScript.

PythonEngine has a property called InitScript. In some demos it contains code with python 2 print statements

[pyscripter]

Also, about the Form.Position, I'll try to think of it; the thing is I don't have a high dpi monitor here so I won't notice it if something is off there.

Just set the Form.Postion property to Default.

Actually just ingnore the above comment and leave Form.Position as is.

[ReinierNL]

Oh. Well, in the ones I did today I've modified it to Default. From here on I'll leave it as is.

[ReinierNL]

Hi Kiriakos, I just took a look at Demo13. That one may probably also be moved to 'deprecated', because it uses TPythonDatabase, which is declared in unit PythonDatabase.pas which is under the Unsupported folder.
And the demo also uses TTable which is no longer available in Delphi (I think since Delphi 10.2; see for example https://stackoverflow.com/questions/44314923/cannot-resolve-unit-name-dbtables-at-line-20-bde).