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Bug: Output gets hidden on stop_and_persist in Jupyter notebooks #59

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manrajgrover opened this issue May 14, 2018 · 5 comments · May be fixed by #133 or #143
Open

Bug: Output gets hidden on stop_and_persist in Jupyter notebooks #59

manrajgrover opened this issue May 14, 2018 · 5 comments · May be fixed by #133 or #143
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bug hacktoberfest help wanted jupyter up-for-grabs

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@manrajgrover
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Description

Currently, in jupyter notebooks, the final stop_and_persist output is not persisted. I've opened an issue in ipywidget for understanding the issue a little better (jupyter-widgets/ipywidgets#2072).

System settings

  • Operating System: Mac OS 10.13.1
  • Terminal in use: NA
  • Jupyter version: 4.4.0
  • Python version: 2.7.14
  • Halo version: 9f9ea37
  • pip freeze output: NA

Error

The output display is not persited on stop_and_persist call.

Expected behaviour

The output should be persited on stop_and_persist call.

Steps to recreate

widget bug

People to notify

@jungwinter @manrajgrover
@manrajgrover
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@jungwinter Could you look into this as well?

@winterjung
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winterjung commented May 17, 2018 •
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Sorry for late response. I checked this issue in python 2.7.13 and find this line is making the problem.

https://github.com/ManrajGrover/halo/blob/4dbaa1a52356281cdf18cc1ce19016ad9276c09e/halo/halo_notebook.py#L38

After removing that line, final output seems to be resolved. Would you like to check this solution? I guess it caused by this change, but not sure.

@manrajgrover
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@jungwinter Yes, it seems to resolve the issue. I'm not sure if it breaks anything else.

@mschmo
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mschmo commented Oct 12, 2019 •
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I'd love to check this out for hacktoberfest. @jungwinter thanks for the starting point.

@mschmo
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mschmo commented Oct 15, 2019

I looked into this a bit today. This commit caused the bug.

The reason why is ip.events.register('post_run_cell', clean_up) fires after every cell execution, which calls clear() and clears the last output.

I don't want to simply revert that commit, because it seems like there was a good reason for wanting to clean up after execution. Maybe @manrajgrover you can expand on what issue that commit is fixing? I notice it replaced a previous callback to handle SIGINT.

hafiz703 added a commit to hafiz703/halo that referenced this issue Oct 21, 2019
@hafiz703
Update halo.py to fix issue manrajgrover#59
0de14ff 
Output gets hidden on stop_and_persist in Jupyter notebooks - added output to self.output.outputs instead of reassignment to persist output when cell finishes running.
@hafiz703 hafiz703 linked a pull request Oct 21, 2019 that will close this issue
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@norweeg norweeg linked a pull request Mar 7, 2020 that will close this issue
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@mschmo @manrajgrover @winterjung