Optional dependencies within groups

[austinmw]

• I have searched the issues of this repo and believe that this is not a duplicate.

Issue

Hi, I can't seem to find out how to add optional dependencies within a group.

For example I'd like the last dependency to be an optional / extra install within the group_a:

[tool.poetry.group.group_a.dependencies]
ipython = "^8.4.0"
cython = "^0.29.33"
numpy = "^1.22.3"
statsmodels = "^0.13.2"
mxnet = {version = "^1.9.1", optional = true} # Doesn't work with M1 Macs

I only want this to be optionally installable if group_a is installed.

---

I tried adding

[tool.poetry.extras]
group_a = ["mxnet"]

And installing with poetry install -E group_a but this didn't work.

[dimbleby]

duplicate #4842 please close

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