IPykernel in Poetry not recognised

[nils-werner]

Prerequisites

• Have you checked the solutions in our troubleshooting guide for common problems ?
• Have you checked that your issue isn't already filed ?

Description

For some reason Hydrogen does not pick up Jupyter kernels in a virtualenv that was created using Poetry.

Steps to Reproduce

Create a pyproject.toml file

[tool.poetry]
name = "testbla"
version = "0.1.0"
description = ""
authors = ["Nobody <[email protected]>"]

[tool.poetry.dependencies]
python = "^3.7"
jupyter = "^1.0.0"

[tool.poetry.dev-dependencies]

[build-system]
requires = ["poetry>=0.12"]
build-backend = "poetry.masonry.api"

install it

poetry install

And run Atom

poetry run atom .

or

poetry shell
atom .

Run a Python cell. A No Kernels installed message appears.

For comparison, virtualenv works:

virtualenv test; cd test
pip install jupyter
atom . 

Versions

OS version:

macOS 10.15.2 Catalina using Homebrew's Python

atom --version

Atom    : 1.42.0
Electron: 4.2.7
Chrome  : 69.0.3497.128
Node    : 10.11.0

apm --version

apm  2.4.3
npm  6.2.0
node 10.2.1 x64
atom 1.42.0
python 3.7.6
git 2.24.1

Hydrogen version: 2.13.1

Plugins

Have you installed and activated any of the Hydrogen plugins below ?

• hydrogen-python
• Hydrogen Launcher
• Data Explorer

Logs

There is no log output in the Dev Console.

Expected behavior

Hydrogen should recognise Jupyter kernels in both plain virtualenvs and Poetry virtualenvs.

[wadethestealth]

Seems like even though you are in the activated environment it is not able to find where the kernel was installed. I can look into this soon and see whats going on thank you for the detailed report steps 😄

[nils-werner]

Yes, and the weird thing is that

jupyter
jupyter notebook
jupyter kernelspec list

et al worked just fine in both virtualenvs... (run poetry shell first or prepend each line with poetry run to run them in Poetry)

[wadethestealth]

@guyujun #1865 is a duplicate. Read the original issue for explanation on current hydrogen installation (v2.13.1 is broken right now).

[guyujun]

Thanks，last night I remove the content of the markdown.css from hydrogen，it works well（v2.13.1）

…

---Original--- From: "Thomas Denton"<[email protected]&gt; Date: Wed, Jan 29, 2020 03:33 AM To: "nteract/hydrogen"<[email protected]&gt;; Cc: "Mention"<[email protected]&gt;;"guyu"<[email protected]&gt;; Subject: Re: [nteract/hydrogen] IPykernel in Poetry not recognised (#1859) @guyujun #1865 is a duplicate. Read the original issue for explanation on current hydrogen installation (v2.13.1 is broken right now). — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or unsubscribe.

[nils-werner]

I found out that the issue was because I was using Poetry from Homebrew.

That version of Poetry does something messy with PYTHONPATH that creates half-complete virtualenvs and apparently also breaks Hydrogen.

Installing Poetry as recommended fixes this problem.