Fix use of pyside6 >= 6.7.0 (#14510)
Fixes
#14463.
Using `pyside6 >= 6.7.0` as the `qt6` gui loop gives the following
error:
```
In [1]: %gui qt6
In [2]: Traceback (most recent call last):
File "/Users/iant/micromamba/envs/temp/bin/ipython", line 8, in <module>
sys.exit(start_ipython())
^^^^^^^^^^^^^^^
File "/Users/iant/github/ipython/IPython/__init__.py", line 130, in start_ipython
return launch_new_instance(argv=argv, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/iant/micromamba/envs/temp/lib/python3.12/site-packages/traitlets/config/application.py", line 1075, in launch_instance
app.start()
File "/Users/iant/github/ipython/IPython/terminal/ipapp.py", line 317, in start
self.shell.mainloop()
File "/Users/iant/github/ipython/IPython/terminal/interactiveshell.py", line 917, in mainloop
self.interact()
File "/Users/iant/github/ipython/IPython/terminal/interactiveshell.py", line 902, in interact
code = self.prompt_for_code()
^^^^^^^^^^^^^^^^^^^^^^
File "/Users/iant/github/ipython/IPython/terminal/interactiveshell.py", line 845, in prompt_for_code
text = self.pt_app.prompt(
^^^^^^^^^^^^^^^^^^^
File "/Users/iant/micromamba/envs/temp/lib/python3.12/site-packages/prompt_toolkit/shortcuts/prompt.py", line 1035, in prompt
return self.app.run(
^^^^^^^^^^^^^
File "/Users/iant/micromamba/envs/temp/lib/python3.12/site-packages/prompt_toolkit/application/application.py", line 978, in run
result = loop.run_until_complete(coro)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/iant/micromamba/envs/temp/lib/python3.12/asyncio/base_events.py", line 674, in run_until_complete
self.run_forever()
File "/Users/iant/micromamba/envs/temp/lib/python3.12/asyncio/base_events.py", line 641, in run_forever
self._run_once()
File "/Users/iant/micromamba/envs/temp/lib/python3.12/asyncio/base_events.py", line 1948, in _run_once
event_list = self._selector.select(timeout)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/iant/micromamba/envs/temp/lib/python3.12/site-packages/prompt_toolkit/eventloop/inputhook.py", line 150, in select
self.inputhook(InputHookContext(self._r, input_is_ready))
File "/Users/iant/github/ipython/IPython/terminal/pt_inputhooks/qt.py", line 50, in inputhook
_appref = app = QtGui.QApplication([" "])
^^^^^^^^^^^^^^^^^^
AttributeError: module 'PySide6.QtPrintSupport' has no attribute 'QApplication'
If you suspect this is an IPython 8.28.0.dev bug, please report it at:
https://github.com/ipython/ipython/issues
or send an email to the mailing list at ipython-dev@python.org
You can print a more detailed traceback right now with "%tb", or use "%debug"
to interactively debug it.
Extra-detailed tracebacks for bug-reporting purposes can be enabled via:
%config Application.verbose_crash=True
```
This is because we use the imported module's `__dict__` to get the
classes and functions available in the module here:
https://github.com/ipython/ipython/blob/9b8cd4a397e5894ffeadad52477bb53e0fb664fc/IPython/external/qt_loaders.py#L309-L311
This no longer works as not all the classes and functions are in the
`__dict__`. The solution in this PR is to use `dir(module)` instead.
I have tested this locally using `pyside6` 6.6.3.1, 6.7.0, 6.7.1 and
6.7.2 and it works for me. It also successfully creates Matplotlib plots
using for example
```
In [1]: %matplotlib qt6
In [2]: import matplotlib.pyplot as plt
In [3]: plt.plot([1,3,2])
```
It would be good to get independent confirmation that this fixes other
downstream libraries as I tend to work directly with IPython and
IPyKernel.
