AttributeError: 'NotebookApp' object has no attribute 'background_tasks' about euporie

[joouha]

Hello! I'm glad you like euporie

There seem to be three separate issues here:

1. Kernel died before replying to kernel_info error

   This is probably because your ipykernel install is messed up somehow. You can usually fix this by re-installing ipykernel, then re-registering the kernel as follows:

   python -m ipykernel install --user 

2. 'NotebookApp' object has no attribute 'background_tasks' error

   I just noticed this myself yesterday - it's due to a change in the latest version of prompt_toolkit (v3.0.33). I've pushed a fix (67f64f6) and made a new release (v2.1.5), so if you upgrade euporie hopefully this will be fixed.

3. GCC required to install euporie in Python 3.11

   The reason for this is that Python 3.11 was only released just over a month ago, and it takes time for package maintainers to build and release new wheels for packages with compiled components. This is why pip is having to compile some packages from source, and hence the need for GCC.

   I just tried installing euporie on Debian Bookworm with Python 3.11, and pip had to compile yarl from source, which required python3.11-dev and gcc to be installed. Once yarl releases wheels for 3.11, GCC should no longer be necessary. There is an issue for this here: aio-libs/yarl#781

I hope this helps

[jessebot]

Very late responding but yes, with the latest version, and fixing my ipykernel for python3.11 (who knows what i did with that), we are good to go! Thank you for your help! :)

[jessebot]

This also happens when installing Debian Bookworm with , however, at a later stage. It happens after I've run the following :

• sudo apt install gcc-11
• pip3.11 install --user euporie
• pip3.11 install ipykernel
• run euporie notebook command
• create a new notebook with CTRL+n
• add some content to a cell, in this case just print("hi friends") for testing
• hit tab and then go to Run -> Run -> either option

Then it doesn't do anything, so I quit, and then there's the same error that was present on macOS, but in Debian this time:

2022-12-01 09:08:14 CRITICAL Uncaught exception              euporie.core.log.handle_exception:421                             Traceback (most recent call last):
                               File "/home/friend/.local/bin/euporie", line 8, in <module>
                                 sys.exit(main())
                                          ^^^^^^
                              File
                             "/home/friend/.local/lib/python3.11/site-packages/euporie/core/__mai…
                             , line 10, in main    return entry.load().launch()
                                        ^^^^^^^^^^^^^^^^^^^^^
                              File
                             "/home/friend/.local/lib/python3.11/site-packages/euporie/core/launc…
                             , line 32, in launch    main(app)
                              File
                             "/home/friend/.local/lib/python3.11/site-packages/euporie/core/__mai…
                             , line 10, in main    return entry.load().launch()
                                        ^^^^^^^^^^^^^^^^^^^^^
                              File
                             "/home/friend/.local/lib/python3.11/site-packages/euporie/core/app.p…
                             , line 534, in launch    return cls().run()
                                        ^^^^^^^^^^^
                              File
                             "/home/friend/.local/lib/python3.11/site-packages/prompt_toolkit/app…
                             , line 978, in run    return loop.run_until_complete(
                                        ^^^^^^^^^^^^^^^^^^^^^^^^
                              File
                             "/home/linuxbrew/.linuxbrew/opt/python@3.11/lib/python3.11/asyncio/b…
                             , line 650, in run_until_complete    return future.result()
                                        ^^^^^^^^^^^^^^^
                              File
                             "/home/friend/.local/lib/python3.11/site-packages/prompt_toolkit/app…
                             , line 891, in run_async    await self.
                             cancel_and_wait_for_background_tasks()  File
                             "/home/friend/.local/lib/python3.11/site-packages/euporie/core/app.p…
                             , line 832, in cancel_and_wait_for_background_tasks    for task in
                             self.background_tasks:                ^^^^^^^^^^^^^^^^^^^^^
                             AttributeError: 'NotebookApp' object has no attribute 'background_tas
                             ks'

[jessebot]

Thank you for your quick reply, I will give this a try asap! :)