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[Jan Larres <2026250@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When trying to use the left and right cursor keys I get this exception:


calibre, version 6.22.0
ERROR: Unhandled exception: <b>ValueError</b>:&lt;flag 'KeyboardModifier'&gt;: no members with value 2147483648

calibre 6.22  embedded-python: False
Linux-6.1.0-7-amd64-x86_64-with-glibc2.37 Linux ('64bit', 'ELF')
('Linux', '6.1.0-7-amd64', '#1 SMP PREEMPT_DYNAMIC Debian 6.1.20-1 (2023-03-19)')
Python 3.11.4
Interface language: None
Successfully initialized third party plugins: DeDRM (10, 0, 3) && Find Duplicates (1, 10, 8) && KePub Metadata Reader (3, 4, 3) && KePub Metadata Writer (3, 4, 3) && KePub Output (3, 6, 3) && Kobo Utilities (2, 16, 8) && KoboTouchExtended (3, 6, 3) && Quality Check (1, 13, 4)
Traceback (most recent call last):
  File "/usr/lib/calibre/calibre/gui2/widgets.py", line 542, in event
    ev.modifiers() & ~Qt.KeyboardModifier.KeypadModifier) == Qt.KeyboardModifier.ControlModifier):
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/enum.py", line 1542, in __invert__
    self._inverted_ = self.__class__(self._flag_mask_ ^ self._value_)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/enum.py", line 711, in __call__
    return cls.__new__(cls, value)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/enum.py", line 1136, in __new__
    raise exc
  File "/usr/lib/python3.11/enum.py", line 1113, in __new__
    result = cls._missing_(value)
             ^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/enum.py", line 1454, in _missing_
    raise ValueError('%r: no members with value %r' % (cls, unknown))
ValueError: <flag 'KeyboardModifier'>: no members with value 2147483648


This seems to be caused by enum changes in Python 3.11. Here is a test with Python 3.10 and Python 3.11:

$ docker run --rm -it python:3.10
Unable to find image 'python:3.10' locally
3.10: Pulling from library/python
d52e4f012db1: Pull complete 
7dd206bea61f: Pull complete 
2320f9be4a9c: Pull complete 
6e5565e0ba8d: Pull complete 
d3797e13cc41: Pull complete 
f8108bc94b5f: Pull complete 
3d35965ce4db: Pull complete 
4459f6d56468: Pull complete 
Digest: sha256:1b2e0805e24189fbba4e55b9bee89e3c25533cbe4fb71ae151f3e7ae0c9b86c5
Status: Downloaded newer image for python:3.10
Python 3.10.12 (main, Jul  4 2023, 05:58:45) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from PyQt6.QtCore import Qt
>>> Qt.KeyboardModifier
<enum 'KeyboardModifier'>
>>> Qt.KeyboardModifier.KeypadModifier
<KeyboardModifier.KeypadModifier: 536870912>
>>> ~Qt.KeyboardModifier.KeypadModifier
<KeyboardModifier.GroupSwitchModifier|MetaModifier|AltModifier|ControlModifier|ShiftModifier: 1577058304>
>>> 

$ docker run --rm -it python:3.11
Unable to find image 'python:3.11' locally
3.11: Pulling from library/python
d52e4f012db1: Already exists 
7dd206bea61f: Already exists 
2320f9be4a9c: Already exists 
6e5565e0ba8d: Already exists 
d3797e13cc41: Already exists 
70f90dfe001b: Pull complete 
bd75605de417: Pull complete 
3d0e1a4b14bc: Pull complete 
Digest: sha256:b7a504dd0affeb20cf1ba1d3219f854c889c7ad557a2a5a4c4aba19cadd075f1
Status: Downloaded newer image for python:3.11
Python 3.11.4 (main, Jul  4 2023, 05:25:16) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from PyQt6.QtCore import Qt
>>> Qt.KeyboardModifier
<flag 'KeyboardModifier'>
>>> Qt.KeyboardModifier.KeypadModifier
<KeyboardModifier.KeypadModifier: 536870912>
>>> ~Qt.KeyboardModifier.KeypadModifier
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.11/enum.py", line 1542, in __invert__
    self._inverted_ = self.__class__(self._flag_mask_ ^ self._value_)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/enum.py", line 711, in __call__
    return cls.__new__(cls, value)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/enum.py", line 1136, in __new__
    raise exc
  File "/usr/local/lib/python3.11/enum.py", line 1113, in __new__
    result = cls._missing_(value)
             ^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/enum.py", line 1454, in _missing_
    raise ValueError('%r: no members with value %r' % (cls, unknown))
ValueError: <flag 'KeyboardModifier'>: no members with value 2147483648
>>>

Note that in both of the above cases I installed PyQt6 with 'pip install
pyqt6==6.4.2' with docker exec before importing. I'm not sure why
Qt.KeyboardModifier is an 'enum' in 3.10 and a 'flag' in 3.11, that may
be caused by PyQt behaving differently depending on the Python version.

I was able to work around the issue by commenting out the two overridden
event() methods introduced in
https://github.com/kovidgoyal/calibre/commit/dcf48d9945590db3d74e4928837d99af5ea775a8,
but they're presumably still necessary for macOS.

** Affects: calibre (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2026250

Title:
  Exception when using cursor keys in edit fields

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