%matplotlib widget infinite loop and running

[eskemojoe007]

Environment data

• VS Code version: 1.51.1
• Jupyter Extension version (available under the Extensions sidebar): 2020.12.411183155
• Python Extension version (available under the Extensions sidebar): 2020.11.371526539
• OS (Windows | Mac | Linux distro) and version: Windows 10 Enterprise
• Python and/or Anaconda version: Python 3.8.6
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): N/A
• Jupyter server running: Local
• ipympl version: 0.5.8 (with restart already applied)

Expected behaviour

Using ipympl and %matplotlib widget to plot within a widget for zoom and other functionality from a standar python file using sections such as # %%

Actual behaviour

Infinite executuion of the cell

Steps to reproduce:

main.py

# %%
import matplotlib.pyplot as plt
%matplotlib widget
plt.plot([1,2,3,4],[1,2,3,4])

Running with jupyter: run current cell

Note: This works when in a native notebook, just not in a python standard python file

Logs

Output for Jupyter in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Jupyter)

> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py -c "import jupyter"
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py -c "import jupyter"
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py -c "import notebook"
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py -c "import notebook"
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py jupyter kernelspec --version
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py jupyter kernelspec --version
> ~\AppData\Local\Programs\Python\Python38\python.exe -c "import os;print(os.path.realpath("C:\\Users\\USERNAME\\AppData\\Roaming\\jupyter\\kernels"))"
> ~\AppData\Local\Programs\Python\Python38\python.exe -c "import os;print(os.path.realpath("C:\\Users\\USERNAME\\AppData\\Roaming\\jupyter\\kernels"))"
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py -c "import ipykernel"
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py -c "import ipykernel"
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py -c "import ipykernel"
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py -c "import ipykernel"
Error 2020-12-10 14:08:56: Jupyter Kernel Spec not found for a local connection
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.kernel_launcher_daemon -v
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.kernel_launcher_daemon -v
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py -c "import ipykernel"
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py -c "import ipykernel"
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.kernel_launcher_daemon -v
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.kernel_launcher_daemon -v
Started kernel Python 3.8.6 64-bit
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py -c "import ipykernel"
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py -c "import ipykernel"
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.kernel_launcher_daemon -v
> ~\AppData\Local\Programs\Python\Python38\python.exe c:\Users\USERNAME\.vscode\extensions\ms-toolsai.jupyter-2020.12.411183155\pythonFiles\pyvsc-run-isolated.py vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.kernel_launcher_daemon -v

[DonJayamanne]

Thanks for reporting this issue, I can replicate this at my end.

[DonJayamanne]

@eskemojoe007 We have resolved this issue and published a new version of the extension with the fix.
Please update the Jupyter extension.

[eskemojoe007]

Confirmed that it now works. Thanks for the speedy work ya'll.