Errors shown under wrong cell using magics

Hi, I'm facing an issue where Traceback is shown under first cell, where IPyParallel is defined, not under the actual cell in which error was raised.

Steps to reproduce:

Terminal 1

pip install jupyter ipyparallel
ipcluster nbextension enable
jupyter server extension enable ipyparallel
ipcluster start --n=1

Terminal 2

jupyter notebook

Create new notebook
Cell 1: import this -> works fine
Cell 2:

import ipyparallel as ipp
rc = ipp.Client()
dview = rc[:]

-> works fine
6. Cell 3:

%%px
import os
print(f"Hello from engine {os.getpid()}")

-> works fine
7. Cell 4:

1/0

-> Traceback is printed under cell 2

What's more, further execution of cell 4 results in adding Traceback under cell 2, when cell 2 is re-run then Traceback stopped to show.

BugReproduce.zip

Additional: %pxresult shows Traceback in cell were it was executed

Any idea how to overcome it?

Thanks for reporting! This is fixed by #905

If you need a workaround today, you can do the same thing with some private API calls:

import sys
from threading import current_thread


def _detach_thread_output(rc):
    thread_ident = current_thread().ident
    for stream in [sys.stdout, sys.stderr]:
        for name in ("_thread_to_parent", "_thread_to_parent_header"):
            mapping = getattr(stream, name, None)
            if mapping:
                mapping.pop(thread_ident, None)

rc._io_loop.add_callback(_detach_thread_output, rc)

@minrk

@minrk Thank you very much :)

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Errors shown under wrong cell using magics #893

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Errors shown under wrong cell using magics #893

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minrk commented on Oct 30, 2024

piotrszajer commented on Nov 4, 2024

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