Export uses the wrong interpreter to perform the export

[rchiodo]

It defaults to using the 'jupyter interpreter' instead of using the user's interpreter. This makes it impossible for the user to diagnose errors as the errors don't match what their current interpreter might report.

See this issue:
#710

[rchiodo]

To be clear I don't mean install nbconvert into the user's python interpreter. Just check it first. That would have alleviated some of the issues on the other bug.

Meaning do this:

• Check current interpreter for nbconvert
• If there, try running the export command
• If fails, try the old code path

[DavidKutu]

related to microsoft/vscode-python#11396

[dhuntley1023]

I concur that the bug @IanMatthewHuff links above is core to this. My notebook fails with the messages above when I do the convert from within Code, but if I do it from the command line ('jupyter nbconvert XXX --to python'), it works fine.

I'm using Conda, and the python interpreter for the extension, and the one for the notebook are both the same as the environment where I did this from the command line.

[greazer]

Keeping this as must-fix since #710 is affecting many users. We closed that bug in the python repo prior to opening the jupyter repo.

[IanMatthewHuff]

@greazer Hang on a second. I think that I already fixed this. Did this maybe get moved over from a completed pipeline?

[IanMatthewHuff]

Yeah, this was fixed.

It was this PR here in python: microsoft/vscode-python#14308
And this one in Jupyter: #181

[rchiodo]

This doesn't seem to be fixed?

Repro steps:

1. Open notebook
2. Switch kernel to new env
3. Install nbconvert in new env
4. Run export

It uses the jupyter interpreter instead?

Looking at the callstack, I'm not sure how it would ever get passed a candidate interpreter.

[IanMatthewHuff]

@rchiodo are you using the command from the palette Jupyter: Export to HTML? Realized that I fixed this working with the ExportAs button, which does pass and use a candidate interpreter. Pretty sure that I didn't look at the palette commands. Will probably have to make an additional fix for them.

[rchiodo]

I used the export button at the top of a native notebook.

[joyceerhl]

Validated.