Problem running Leo after installing Python 3.12

[lewis]

On Windows PC I installed Python 3.12 but when I tried running Leo with launchLeo.py I get:

'NoneType' object has no attribute 'gui'

** Leo could not be started **

I also tried running with
>python.exe -m leo.core.runLeo 

but got same result. Has anyone had a similar problem?

[lewis]

It seems I will need PyQt6 v6.5.3 which supports Python v3.12

[Edward K. Ream]

On Thu, Oct 12, 2023 at 4:58 AM lewis <lewi...@fastmail.com.au> wrote:

On Windows PC I installed Python 3.12 but when I tried running Leo with launchLeo.py I get:

'NoneType' object has no attribute 'gui'

** Leo could not be started **

Yes, you must install Qt.

#3604 suggests improving this message.

Edward

[lewis]

I have PyQt6 installed but it is v6.5.2

See https://www.riverbankcomputing.com/pipermail/pyqt/2023-October/045542.html

[Matt Wilkie]

There is also a problem with Windows-Curses and py 3.12:
https://github.com/leo-editor/leo-editor/issues/3603

(Hello everyone!)

[jkn]

Yes, I've vaguely wondered about Textual (https://www.textualize.io/) as well

    J^n

[Thomas Passin]

I've not been in a hurry to move to Python 3.12.  It's only been out a short while, I don't know how many of the dependencies work yet with 3.12, and so why shouldn't I wait for a while and let everything mature longer?

[Edward K. Ream]

On Thu, Oct 12, 2023 at 11:55 AM Thomas Passin <tbp1...@gmail.com> wrote:

I've not been in a hurry to move to Python 3.12.  It's only been out a short while, I don't know how many of the dependencies work yet with 3.12, and so why shouldn't I wait for a while and let everything mature longer?

I agree on a personal level. But we do want to be able to pip install Leo with Python 3.12.

Imo, the simplest (only?) way to do that is to remove the dependency on windows-curses.

Edward

[lewis]

PyQt version 6.5.3 has been released. It supports Python v3.12. 

After updating PyQt Leo runs on windows with Python 3.12 with no errors.

[Thomas Passin]

My system is running  Python 3.12 with PyQt 6.5.2:

C:\Users\tom>py -m pip list |find /i "pyqt6"
PyQt6               6.5.2
PyQt6-Qt6           6.5.2
PyQt6-sip           13.5.2
PyQt6-WebEngine     6.5.0
PyQt6-WebEngine-Qt6 6.5.2

I had to install it by hand, and the pip install of Leo failed, but once I had installed the dependencies myself I can run my Git clone with PyQt 6.5.2.