[Maya-Python] PySide2/PyQt5 crashes app on error?

[Fredrik Averpil]

Not sure if it's just me or if this is a thing.

So, I've noticed that with e.g. Maya 2015 (Qt4) and PySide, when my UI hits
an error and I get the Traceback in the script editor the UI doesn't
crash/disappear. It's still fully functional in Maya as well as when I run
the UI in the cmd/terminal (standalone).

However, with Maya 2017 (Qt5) and PySide2, the application still prints the
traceback in the script editor but then simply crashes.
If I run the UI in cmd/terminal (standalone) instead, the UI disappears as
well.

The error can be e.g. that when I click a pushButton it calls a function
which prints "hello". But in this case let's say the function was
misspelled so when I click the button a non-existing function is called.

Is this something you guys have observed as well -- or could it be
something specific to my code?

Cheers,
Fredrik

[Marcus Ottosson]

I can confirm this on Windows, or at least some odd behavior.

from PySide2 import QtWidgets
def on_pressed():
priknt("world")

button = QtWidgets.QPushButton("Hello")
button.pressed.connect(on_pressed)
button.show()

For me, when pressing the button, the window with the button in it stalls
and doesn’t do or say anything. The GUI is still responsive and works fine.

When I run:

button.close()

The expected exception appears.

# Error: NameError: file <maya console> line 4: global name 'priknt'
is not defined #

But the GUI remains.

The next time I call close(), the GUI closes, and all is well.

This is with a fresh copy of Maya 2017 on Windows 10, all settings default.
​

Post by Fredrik Averpil
Not sure if it's just me or if this is a thing.
So, I've noticed that with e.g. Maya 2015 (Qt4) and PySide, when my UI
hits an error and I get the Traceback in the script editor the UI doesn't
crash/disappear. It's still fully functional in Maya as well as when I run
the UI in the cmd/terminal (standalone).
However, with Maya 2017 (Qt5) and PySide2, the application still prints
the traceback in the script editor but then simply crashes.
If I run the UI in cmd/terminal (standalone) instead, the UI disappears as
well.
The error can be e.g. that when I click a pushButton it calls a function
which prints "hello". But in this case let's say the function was
misspelled so when I click the button a non-existing function is called.
Is this something you guys have observed as well -- or could it be
something specific to my code?
Cheers,
Fredrik
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[Fredrik Averpil]

Yes, I see this behavior in both Windows 10 and macOS (Sierra) when using
Maya 2017.

So what's new here in Maya 2017 is the UI completely freezes - when
compared to Maya 2016 where it is completely functional although it casts
an error in the script editor.

This behavior is also the same when running this PySide2 code in the
terminal on macOS. But if you're using PyQt5, the UI completely crashes and
disappears instantly.

Hm.

Post by Marcus Ottosson
I can confirm this on Windows, or at least some odd behavior.
from PySide2 import QtWidgets
priknt("world")
button = QtWidgets.QPushButton("Hello")
button.pressed.connect(on_pressed)
button.show()
For me, when pressing the button, the window with the button in it stalls
and doesn’t do or say anything. The GUI is still responsive and works fine.
button.close()
The expected exception appears.
# Error: NameError: file <maya console> line 4: global name 'priknt' is not defined #
But the GUI remains.
The next time I call close(), the GUI closes, and all is well.
This is with a fresh copy of Maya 2017 on Windows 10, all settings default.
​
Not sure if it's just me or if this is a thing.
So, I've noticed that with e.g. Maya 2015 (Qt4) and PySide, when my UI
hits an error and I get the Traceback in the script editor the UI doesn't
crash/disappear. It's still fully functional in Maya as well as when I run
the UI in the cmd/terminal (standalone).
However, with Maya 2017 (Qt5) and PySide2, the application still prints
the traceback in the script editor but then simply crashes.
If I run the UI in cmd/terminal (standalone) instead, the UI disappears as
well.
The error can be e.g. that when I click a pushButton it calls a function
which prints "hello". But in this case let's say the function was
misspelled so when I click the button a non-existing function is called.
Is this something you guys have observed as well -- or could it be
something specific to my code?
Cheers,
Fredrik
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*Marcus Ottosson*
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[Fredrik Averpil]

So, this definitively seems like some kind of bug to me. I don't want my
application to stall indefinitely on end-users ever. I opened a bug report:
https://bugreports.qt.io/browse/PYSIDE-364

Please add your +1's, comments or ideas to the report. I think this is a
quite severe issue.

I really prefer "nothing happens when I click the button!" instead of "aaaw
f@¢$, I lost all my work!".

Regards,
Fredrik

[t***@gmail.com]

Was this ever resolved? I'm getting the exact issue trying to import any for of pyside2 gui in maya 2017 macos..

Post by Fredrik Averpil
https://bugreports.qt.io/browse/PYSIDE-364
Please add your +1's, comments or ideas to the report. I think this is a quite severe issue.
Regards,
Fredrik

[Justin Israel]

Post by t***@gmail.com
Was this ever resolved? I'm getting the exact issue trying to import any
for of pyside2 gui in maya 2017 macos..

Do you get an error simply importing PySide2 in Maya 2017? Because that
wouldn't be the same issue as previously described.

Post by t***@gmail.com

Post by Fredrik Averpil
So, this definitively seems like some kind of bug to me. I don't want my
https://bugreports.qt.io/browse/PYSIDE-364
Please add your +1's, comments or ideas to the report. I think this is a

quite severe issue.

Post by Fredrik Averpil
I really prefer "nothing happens when I click the button!" instead of
Regards,
Fredrik

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[James Porter]

No. I’m getting an error when ever I try to launch any for of pyside2 guy
in Maya.

I can import pyside, qtcore, qtwidgets shiboken2 etc without any problem

Post by t***@gmail.com
Was this ever resolved? I'm getting the exact issue trying to import any
for of pyside2 gui in maya 2017 macos..

Do you get an error simply importing PySide2 in Maya 2017? Because that
wouldn't be the same issue as previously described.

Post by t***@gmail.com

Post by Fredrik Averpil
So, this definitively seems like some kind of bug to me. I don't want my
https://bugreports.qt.io/browse/PYSIDE-364
Please add your +1's, comments or ideas to the report. I think this is a

quite severe issue.

Post by Fredrik Averpil
I really prefer "nothing happens when I click the button!" instead of
Regards,
Fredrik

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[Justin Israel]

Post by James Porter
No. I’m getting an error when ever I try to launch any for of pyside2 guy
in Maya.
I can import pyside, qtcore, qtwidgets shiboken2 etc without any problem

Again, that sounds like a different problem. What was previously described
was the behavior of Qt code that raises exceptions in its logic which are
not caught.

So it is different if you try to launch simply any gui code and it crashes.
What error messages are you seeing?

Post by James Porter

Post by t***@gmail.com
Was this ever resolved? I'm getting the exact issue trying to import any
for of pyside2 gui in maya 2017 macos..

Do you get an error simply importing PySide2 in Maya 2017? Because that
wouldn't be the same issue as previously described.

Post by t***@gmail.com

Post by Fredrik Averpil
So, this definitively seems like some kind of bug to me. I don't want

my application to stall indefinitely on end-users ever. I opened a bug

Post by Fredrik Averpil
https://bugreports.qt.io/browse/PYSIDE-364
Please add your +1's, comments or ideas to the report. I think this is

a quite severe issue.

Post by Fredrik Averpil
I really prefer "nothing happens when I click the button!" instead of
Regards,
Fredrik

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[James Porter]

Fair enough, Justin!

I’ll start a new thread with some detailed info!!

Thanks

James

Post by James Porter
No. I’m getting an error when ever I try to launch any for of pyside2 guy
in Maya.
I can import pyside, qtcore, qtwidgets shiboken2 etc without any problem

Again, that sounds like a different problem. What was previously described
was the behavior of Qt code that raises exceptions in its logic which are
not caught.

So it is different if you try to launch simply any gui code and it crashes.
What error messages are you seeing?

Post by James Porter

Post by t***@gmail.com
Was this ever resolved? I'm getting the exact issue trying to import any
for of pyside2 gui in maya 2017 macos..

Do you get an error simply importing PySide2 in Maya 2017? Because that
wouldn't be the same issue as previously described.

Post by t***@gmail.com

Post by Fredrik Averpil
So, this definitively seems like some kind of bug to me. I don't want

my application to stall indefinitely on end-users ever. I opened a bug

Post by Fredrik Averpil
https://bugreports.qt.io/browse/PYSIDE-364
Please add your +1's, comments or ideas to the report. I think this is

a quite severe issue.

Post by Fredrik Averpil
I really prefer "nothing happens when I click the button!" instead of
Regards,
Fredrik

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[Alexander Morano]

Well, I will bring back the dead, on topic.

I get this, Maya 2018, using PyQt5.

If there is an "exception" in the window, at any time, I get a silent,
immediate crash.

Nothing logged.

Was this ever resolved by anyone (AD, Riverbank, etc....)?

Is this the new behavior to expect with PyQt5 and Maya 2018-> ???

Feels super bad atm.

Post by Fredrik Averpil
So, this definitively seems like some kind of bug to me. I don't want my
https://bugreports.qt.io/browse/PYSIDE-364
Please add your +1's, comments or ideas to the report. I think this is a
quite severe issue.
I really prefer "nothing happens when I click the button!" instead of
Regards,
Fredrik

['Michel Satorra' via Python Programming for Autodesk Maya]

Hello,

Same here, trying to change my scripts from pyqt4 to pyqt5 and get maya
crash. I have a stack trace in the terminal but nothing about my script.
I think the bug is still open there :
https://bugreports.qt.io/browse/PYSIDE-478

Post by Alexander Morano
Well, I will bring back the dead, on topic.
I get this, Maya 2018, using PyQt5.
If there is an "exception" in the window, at any time, I get a silent,
immediate crash.
Nothing logged.
Was this ever resolved by anyone (AD, Riverbank, etc....)?
Is this the new behavior to expect with PyQt5 and Maya 2018-> ???
Feels super bad atm.

Post by Fredrik Averpil
So, this definitively seems like some kind of bug to me. I don't want my
https://bugreports.qt.io/browse/PYSIDE-364
Please add your +1's, comments or ideas to the report. I think this is a
quite severe issue.
I really prefer "nothing happens when I click the button!" instead of
Regards,
Fredrik