Jupyterlab cell output issue

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
jupyter, jupyter-notebook, python

Research direction

No files, tests, or entry points are named. Start by reproducing the sample code in JupyterLab with the listed streamz and Jupyter versions, then compare the same cells in a Jupyter notebook; done means each cell displays its own output consistently.

Written by the indexing model from the issue text.

Description

I just discovered steamz and think it looks great. However, when I try to run some of the sample code in a Jupyterlab notebook, I experience some strange behavior where the I sometimes get output of "Output()" and then, when running a subsequent cell, get the output of the previous cell. This only happens in Jupyterlab not a Jupyter notebook.

streamz

Here are some package versions installed:

anaconda-client==1.7.2
anaconda-navigator==1.9.7
anaconda-project==0.8.3
dask==2.5.2
dask-labextension==1.1.0
ipywidgets==7.5.1
jupyter==1.0.0
jupyter-client==6.0.0
jupyter-console==6.0.0
jupyter-core==4.6.3
jupyter-server-proxy==1.2.0
jupyterlab==2.0.0
jupyterlab-server==1.0.6
nbconvert==5.6.0
nbformat==4.4.0
notebook==6.0.3
streamz==0.5.2
toolz==0.10.0
tornado==6.0.3
widgetsnbextension==3.5.1

Any thoughts?

(I also had the same behavior using the docker container PR)

All on a mac with Mojave 10.14

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