pymel Maya 2024

[Design0r]

Hi, quick question about Maya 2024.
I'm not sure if this is a bug or if im doing something wrong.
If i execute following pymel script on a fresh maya start it always returns true and runs the print command the first time i execute this snippet.
It doesnt matter how the window is called. On the second and any following execute it works as expected.

if pm.window("just_some_random_text", exists=True):
    print("yep")

changing from the pymel api to maya.cmds:

if cmds.window("just_some_random_text", exists=True):
    print("yep")

always works, even the first time (On a new Maya instance). This seems to only be a problem in maya 2024. I tried in in 2023 and the pymel version works properly.
Any Idea whats causing this behavior?

[SolenOchHavet]

I was just about to report the same :) I started to look into it a bit. This is what I noticed:

The result of:

pm.window("just_some_random_text", exists=True)

Will be:

ui.Window(False)

That's why it prints the first time :) This means now that this will suddenly return True:

pm.window("False", exists=True)

If you had a fresh session, you could have done this as well once:

pm.ui.Window(False)

I that line however should have raised. If I look at the internal logic for pm.window() it looks like it's False until it reaches this line:

https://github.com/LumaPictures/pymel/blob/master/pymel/core/windows.py#L1717

And when you look at that method, you see that it simply tries to cast pm.ui.Window(False) but doesn't raise:

https://github.com/LumaPictures/pymel/blob/master/pymel/internal/factories.py#L1022-L1025

So, something has happened to pm.ui.Window.